ignition ACURA CSX 2006 Service Manual PDF

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ECM/PCM Inputs and Outputs at Connector A ( ) (44P)
Terminal
numberWire color Terminal name DescriptionSignal
11-25
NOTE: Standard battery voltage is about 12 V.
4 PUR FANL (RADIATOR FAN CONTROL) Drives radiator fan relay With radiator fan running: about 0 V
With radiator fan stopped: battery voltage
5 GRY FANH (RADIATOR FAN CONTROL) Drives A/C condenser fan
relayWith A/C condenser fan running: about 0 V
With A/C condenser fan stopped: battery voltage
6 GRN MRLY (PGM-FI MAIN RELAY 1) Drives PGM-FI main relay 1
Power source for DTC
memoryWith ignition switch ON (II): about 0 V
With ignition switch OFF: battery voltage
8 ORN IGP (POWER SOURCE) Power source for ECM/PCM circuitWith ignition switch ON (II): battery voltage
9 BLK SG6 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
10 LT GRN VSV (EVAPORATIVE EMISSION (EVAP)
CANISTER VENT SHUT
VALVE) Drives EVAP canister vent
shut valve
With ignition switch ON (II): battery voltage
14 RED ACC (A/C COMPRESSOR CLUTCH RELAY) Drives A/C compressor
clutch relayWith compressor ON: about 0 V
With compressor OFF: battery voltage
15 BRN IMOFPR (IMMOBILIZER FUEL PUMP RELAY) Drives PGM-FI main relay 2
(FUEL PUMP)About 0 V for 2 seconds after turning ignition switch
ON (II), then battery voltage
16 LT GRN ACPD (A/C PRESSURE SENSOR) Detects A/C pressure
sensor signalWith A/C switch ON: about 1.7 4.8 V
(depending on A/C pressure)
17 YEL APSA (ACCELERATOR PEDAL POSITION (APP)
SENSOR A) Detects APP sensor A signal With ignition switch ON (II) and accelerator pedal
pressed: about 4.7 V
With ignition switch ON (II) and accelerator pedal
released: about 0.5 V
18 PUR APSB (ACCELERATOR PEDAL POSITION (APP)
SENSOR B) Detects APP sensor B signal With ignition switch ON (II) and accelerator pedal
pressed: about 2.3 V
With ignition switch ON (II) and accelerator pedal
released: about 0.25 V
19 RED VCC6 (SENSOR VOLTAGE) Provides sensor reference voltageWith ignition switch ON (II): about 5.0 V
20 YEL ETCSRLY (ELECTRONIC THROTTLE CONTROL
SYSTEM (ETCS) CONTROL
RELAY) Drives electronic throttle
control system (ETCS)
control relay
With ignition switch ON (II): about 0 V
(4.0 V momentarily)
21 PNK SUBRLY (PGM-FI SUBRELAY) Drives PGM-FI subrelay With ignition switch ON (II): about 0 V
23 ORN ELD (ELECTRICAL LOAD DETECTOR (ELD)) Detects ELD signal With ignition switch ON (II): about 0.1 4.8 V
(depending on electrical load)
(cont’d)
Terminal side of female terminals
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ECM/PCM Inputs and Outputs at Connector A ( ) (44P)
Terminal
numberWire color Terminal name DescriptionSignal
11-26Fuel and Emissions Systems
System Description (cont’d)
NOTE: Standard battery voltage is about 12 V.
24 GRY VCC5 (SENSOR VOLTAGE) Provides sensor reference voltageWith ignition switch ON (II): about 5.0 V
25 BRN VCC4 (SENSOR VOLTAGE) Provides sensor reference voltageWith ignition switch ON (II): about 5.0 V
26 LT GRN FTP (FUEL TANK PRESSURE (FTP) SENSOR) Detects FTP sensor signal With ignition switch ON (II) and fuel fill cap
removed: about 2.5 V
27 PNK SLS (SHIFT LOCK SOLENOID) Drives shift lock solenoid With ignition switch ON (II), in P, brake pedal
pressed, and accelerator released:
battery voltage
27 GRN RVS (REVERSE LOCKOUT SOLENOID) Drives reverse lockout
solenoidWith vehicle speed below 9 mph (15 km/h):
battery voltage
With vehicle speed above 13 mph (20 km/h):
about 0 V
28 BLU NEP (ENGINE SPEED PULSE) Outputs engine speed pulse With engine running: pulses
29 BLU VSSOUT (VEHICLE SPEED SIGNAL OUTPUT) Sends vehicle speed signal Depending on vehicle speed: pulses
31 BRN SCS (SERVICE CHECK SIGNAL) Detects service check signal With service check signal shorted using HDS:
about 0 V
With service check signal opened: about 5.0 V
33 GRN ECT2 (ENGINE COOLANT TEMPERATURE (ECT)
SENSOR 2) Detects ECT sensor 2 signal With ignition switch ON (II): about 0.1 4.8 V
(depending on engine coolant temperature)
34 LT BLU SG5 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
35 BLU SG4 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
36 WHT CANH (CAN COMMUNICATION SIGNAL
HIGH) Sends communication
signal
With ignition switch ON (II): about 2.5 V (pulses)
37 RED CANL (CAN COMMUNICATION SIGNAL
LOW) Sends communication
signal
With ignition switch ON (II): about 2.5 V (pulses)
1: A/T
3: K20Z3 engine
1
3
Terminal side of female terminals
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ECM/PCM Inputs and Outputs at Connector A ( ) (44P)
Terminal
numberWire color Terminal name DescriptionSignal
11-27
NOTE: Standard battery voltage is about 12 V.
39 BRN BKSWNC (BRAKE PEDAL POSITION SWITCH) Detects brake pedal
position switch signalWith ignition switch ON (II) and brake pedal
released: battery voltage
With ignition switch ON (II) and brake pedal
pressed: about 0 V
40 LT GRN BKSW (BRAKE PEDAL POSITION SWITCH) Detects brake pedal
position switch signalWith brake pedal released: about 0 V
With brake pedal pressed: battery voltage
41 LT BLU CRMTCLS (CRUISE CLUTCH PEDAL POSITION
SIGNAL) Detects clutch pedal
position switch signal
With ignition switch ON (II) and clutch pedal
released: about 0 V
With ignition switch ON (II) and clutch pedal
pressed: battery voltage
42 RED WEN (WRITE ENABLE SIGNAL) Detects write enable signal With ignition switch ON (II): about 0 V
44 PNK S-NET5V (SERIAL COMMUNICATION FOR
IMMOBILIZER) Sends serial
communication signal
With ignition switch ON (II): pulses
With ignition switch OFF: about 5.0 V
2: M/T
(cont’d)
2
Terminal side of female terminals
08/08/21 14:12:43 61SNR030_110_0027
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ECM/PCM Inputs and Outputs at Connector B ( ) (44P)
Terminal
numberWire color Terminal name DescriptionSignal
11-28Fuel and Emissions Systems
System Description (cont’d)
NOTE: Standard battery voltage is about 12 V.




1BLK/RED
(BLK) PG2 (POWER GROUND) Ground circuit for ECM/
PCMLess than 1.0 V at all times
2 BLU/RED EGR (EXHAUST GAS RECIRCULATION (EGR)
VALVE) Drives EGR valve With EGR operating: duty controlled
With EGR not operating: about 0 V
3 YEL/BLU PCS (EVAPORATIVE EMISSION (EVAP)
CANISTER PURGE VALVE) Drives EVAP canister purge
valve
With engine running, engine coolant below 60 °C
(140 °F): battery voltage
With engine running, engine coolant above 60 °C
(140 °F): duty controlled
4 BLK/WHT SO2SHTC (SECONDARY HEATED OXYGEN SENSOR
(SECONDARY HO2S)
HEATER (SENSOR 2)) Drives secondary HO2S
heater (sensor 2)
With ignition switch ON (II): battery voltage
With warmed up engine running: duty controlled
7 YEL/RED OPSW (OIL PRESSURE SWITCH) Detects engine oil pressure
signalWith ignition switch OFF: about 0 V
With engine running: battery voltage
8 BLU/RED OP2SW (2ND CLUTCH TRANSMISSION FLUID
PRESSURE SWITCH) Detects 2nd clutch
transmission fluid pressure
switch inputWith ignition switch ON (II):
Without 2nd clutch pressure: about 5.0 V
With 2nd clutch pressure: about 0 V
9 BLU/WHT OP3SW (3RD CLUTCH TRANSMISSION FLUID
PRESSURE SWITCH) Detects 3rd clutch
transmission fluid pressure
switch inputWith ignition switch ON (II):
Without 3rd clutch pressure: about 5.0 V
With 3rd clutch pressure: about 0 V
10 BLU/BLK SHA (SHIFT SOLENOID VALVE A) Drives shift solenoid
valve AWith engine running in R, D, and S (in 1st, 4th, or
5th gears): battery voltage
With engine running in P, N, D, and S (in 2nd and
3rd gears): about 0 V
11 GRN/WHT SHB (SHIFT SOLENOID VALVE B) Drives shift solenoid
valve BWith engine running in P, R, N, D, and S (in 1st and
2nd gears): battery voltage
With engine running in D and S (in 3rd, 4th, 5th
gears): about 0 V
12 RED/BLK ATPN (TRANSMISSION RANGE SWITCH N) Detects transmission range
switch N position signal
inputIn N: about 0 V
In any position other than N: about 5.0 V
13 BLU/BLK ATPP (TRANSMISSION RANGE SWITCH P) Detects transmission range
switch P position signal
inputIn P: about 0 V
In any position other than P: about 5.0 V
14 WHT ATPR (TRANSMISSION RANGE SWITCH R) Detects transmission range
switch R position signal
inputIn R: about 0 V
In any position other than R: about 5.0 V
15 RED ATPS (TRANSMISSION RANGE SWITCH S) Detects transmission range
switch S position signal
inputIn S: about 0 V
In any position other than S: battery voltage
1: A/T
4: K20Z2 engine
5: ’07-09 models
5
4
1
1
1
1
1
1
1
1
Terminal side of female terminals
08/08/21 14:12:43 61SNR030_110_0028
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ECM/PCM Inputs and Outputs at Connector B ( ) (44P)
Terminal
numberWire color Terminal name DescriptionSignal
11-29
NOTE: Standard battery voltage is about 12 V.


16 BLU/YEL SUPP (PADDLE SHIFTER
(UPSHIFT SWITCH)) Detects paddle shifter
(upshift switch)In S:
With paddle shifter (upshift switch) pressed:
about 0 V
With paddle shifter (upshift switch) released:
battery voltage
17 WHT/RED NM (INPUT SHAFT (MAINSHAFT) SPEED
SENSOR) Detects input shaft
(mainshaft) speed sensor
signalWith ignition switch ON (II): about 0 V
With engine idling in N: about 2.5 V
18 YEL/BLU (YEL)VCC2 (SENSOR VOLTAGE) Provides sensor reference
voltageWith ignition switch ON (II): about 5.0 V
20 GRN SHC (SHIFT SOLENOID VALVE C) Drives shift solenoid
valve CWith engine running in N and S (in 1st, 3rd, and 5th
gears): battery voltage
With engine running in P, R, D, and S (in 2nd and
4th gears): about 0 V
21 YEL/GRN ATPD (TRANSMISSION RANGE SWITCH D) Detects transmission range
switch D position signal
inputIn D: about 0 V
In any position other than D: battery voltage
22 RED/WHT ATPRVS (TRANSMISSION RANGE SWITCH RVS) Detects transmission range
switch RVS position signal
inputIn R: about 0 V
In any position other than R: battery voltage
23 RED/WHT ECT1 (ENGINE COOLANT TEMPERATURE (ECT)
SENSOR 1) Detects ECT sensor 1 signal With ignition switch ON (II): about 0.1 4.8 V
(depending on engine coolant temperature)
24 YEL SHE (SHIFT SOLENOID VALVE E) Drives shift solenoid
valve EWith engine running in P and R: battery voltage
With engine running in N, D, and S (in 1st gear):
about 0 V
25 BLU/YEL LSC (A/T CLUTCH PRESSURE CONTROL
SOLENOID VALVE C) Drives A/T clutch pressure
control solenoid valve C
With ignition switch ON (II): current controlled
26 GRN/RED SHD (SHIFT SOLENOID VALVE D) Drives shift solenoid
valve DWith engine running in D and S (in 2nd and 5th
gears): battery voltage
With engine running in P, R, N, D, and S (in 1st, 3rd,
and 4th gears): about 0 V
27 RED/YEL TATF (ATF TEMPERATURE SENSOR) Detects ATF temperature
signalWith ignition switch ON (II): about 0.2 4.0 V
(about 1.8 V at operating temperature)
(depending on ATF temperature)
28 BLU/YEL ATPFWD (TRANSMISSION RANGE SWITCH FWD) Detects transmission range
switch D and S positions
signalIn D and S: about 0 V
In any other position D and S: battery voltage
29 WHT/BLK EGRP (EXHAUST GAS RECIRCULATION (EGR)
VALVE POSITION SENSOR) Detects EGR valve position
sensor signal
With engine running: about 1.2 3.0 V
(depending on EGR valve lift)
1: A/T
3: K20Z3 engine
4: K20Z2 engine
(cont’d)
1
1
3
1
1
1
1
1
1
1
1
4
Terminal side of female terminals
08/08/21 14:12:44 61SNR030_110_0029
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ECM/PCM Inputs and Outputs at Connector B ( ) (44P)
Terminal
numberWire color Terminal name DescriptionSignal
11-30Fuel and Emissions Systems
System Description (cont’d)
NOTE: Standard battery voltage is about 12 V.


30 RED/BLK VG (MASS AIR FLOW
(MAF) SENSOR SIDE) Detects MAF sensor signal At idle: about 1.1 1.6 V
(between VG terminal and VG terminal)
31 RED/YEL IAT (INTAKE AIR TEMPERATURE (IAT)
SENSOR) Detects IAT sensor signal With ignition switch ON (II): about 0.1 4.0 V
(about 1.8 V at normal operating temperature)
32 BLK/BLU VG (MASS AIR FLOW (MAF) SENSOR SIDE) Ground for MAF sensor
signal
33 GRN/BLK SG2 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
34 GRN/YEL VTS (ROCKER ARM OIL CONTROL SOLENOID) Drives rocker arm oil
control solenoidAt idle: about 0 V
35 BRN LSB (A/T CLUTCH PRESSURE CONTROL
SOLENOID VALVE B) Drives A/T clutch pressure
control solenoid valve B
With ignition switch ON (II): current controlled
36 BLK PG1 (POWER GROUND) Ground circuit for ECM/ PCMLess than 1.0 V at all times
40 BRN SDNP (PADDLE SHIFTER (DOWN SHIFT SWITCH)) Detects paddle shifter
(downshift switch) signalIn S:
With paddle shifter (downshift switch) pressed:
about 0 V
With paddle shifter (downshift switch) released:
about 5.0 V
41 WHT/GRN ALTC (ALTERNATOR CONTROL) Sends alternator control
signalWith warmed up engine running: about 5.0 V
(depending on electrical load)
42 WHT/BLU ALTL (ALTERNATOR L SIGNAL) Detects alternator L signal With ignition switch ON (II): about 0 V
With engine running: battery voltage
43 WHT/RED ALTF (ALTERNATOR FR SIGNAL) Detects alternator FR signal With engine running: about 2.6 3.4 V
(depending on electrical load)
44 RED/BLK LSA (A/T CLUTCH PRESSURE CONTROL
SOLENOID VALVE A) Drives A/T clutch pressure
control solenoid valve A
With ignition switch ON (II): current controlled
1: A/T
1
1
1
Terminal side of female terminals
08/08/21 14:12:44 61SNR030_110_0030
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ECM/PCM Inputs and Outputs at Connector C ( ) (44P)
Terminal
numberWire color Terminal name DescriptionSignal
11-31
NOTE: Standard battery voltage is about 12 V.
1 WHT IG1ETCS (IGNITION SIGNAL ETCS) Detects ignition signal With ignition switch ON (II): battery voltage
2 BLK PGMETCS (POWER GROUND ETCS) Ground circuit for ECM/
PCMLess than 1.0 V at all times
3 GRN/YEL ETCSM (THROTTLE ACTUATOR SIDE) Ground for throttle actuator With ignition switch ON (II): about 0 V
4 BLU/RED ETCSM (THROTTLE ACTUATOR SIDE) Drives throttle actuator With ignition switch ON (II): about 0 V
5 BRN INJ1 (No. 1 INJECTOR) Drives No. 1 injector At idle: duty controlled With ignition switch ON (II): battery voltage
6 RED INJ2 (No. 2 INJECTOR) Drives No. 2 injector
7 BLU INJ3 (No. 3 INJECTOR) Drives No. 3 injector
8 YEL INJ4 (No. 4 INJECTOR) Drives No. 4 injector
9 WHT/GRN AFSHTC (AIR FUEL RATIO
(A/F) SENSOR HEATER
CONTROL (SENSOR 1)) Drives A/F sensor heater
(sensor 1)
With ignition switch ON (II): battery voltage
With fully warmed up engine running: about 0 V
11 GRN/RED MAP (MANIFOLD ABSOLUTE PRESSURE
(MAP) SENSOR) Detects MAP sensor signal With ignition switch ON (II): about 3.0 V
At idle: about 1.0 V (depending on engine speed)
12 BLU VCC3 (SENSOR VOLTAGE) Provides sensor reference voltageWith ignition switch ON (II): about 5.0 V
13 YEL/RED VCC1 (SENSOR VOLTAGE) Provides sensor reference voltageWith ignition switch ON (II): about 5.0 V
14 GRN/WHT SG1 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
15 YEL/GRN IGPLS1 (No. 1 IGNITION COIL PULSE) Drives No. 1 ignition coil With ignition switch ON (II): about 0 V
With engine running: pulses
16 BLU/RED IGPLS2 (No. 2 IGNITION COIL PULSE) Drives No. 2 ignition coil
17 WHT/BLU IGPLS3 (No. 3 IGNITION COIL PULSE) Drives No. 3 ignition coil
18 BRN IGPLS4 (No. 4 IGNITION COIL PULSE) Drives No. 4 ignition coil
20 RED/BLK TPSA (THROTTLE POSITION (TP) SENSOR A) Detects TP sensor A signal With throttle fully open: about 3.9 V
With throttle fully closed: about 0.9 V
21 RED/BLU TPSB (THROTTLE POSITION (TP) SENSOR B) Detects TP sensor B signal With throttle fully open: about 4.1 V
With throttle fully closed: about 1.7 V
(cont’d)
Terminal side of female terminals
08/08/21 14:13:36 61SNR030_110_0031
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ECM/PCM Inputs and Outputs at Connector C ( ) (44P)
Terminal
numberWire color Terminal name DescriptionSignal
11-32Fuel and Emissions Systems
System Description (cont’d)
NOTE: Standard battery voltage is about 12 V.
22 BLU/BLK VTPSW (ROCKER ARM OIL PRESSURE SWITCH) Detects rocker arm oil
pressure switch signalWith engine at low speed: about 0 V
With engine at high speed: battery voltage
23 BLU/WHT VTC (VTC OIL CONTROL SOLENOID VALVE) Drives VTC oil control
solenoid valvewith ignition switch ON (II): about 0 V
27 WHT/RED SHO2S (SECONDARY HEATED OXYGEN SENSOR
(SECONDARY HO2S)
(SENSOR 2)) Detects secondary HO2S
(sensor 2) signal
With throttle fully opened from idle and warmed up
engine: about 0.6 V
With throttle quickly closed: below 0.4 V
29 RED AFS (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1)SIDE) Detects A/F sensor
(sensor 1) signal
30 RED/YEL AFS (AIR FUEL RATIO (A/F) SENSOR (SENSOR 1)SIDE) Detects A/F sensor
(sensor 1) signal
31 GRN CMPB (CAMSHAFT POSITION (CMP) SENSOR
B) Detects CMP sensor B
signal
With engine running: pulses
32 BLU/YEL CKP (CRANKSHAFT POSITION (CKP) SENSOR) Detects CKP sensor signal With engine running: pulses
36 BLK/GRN IG1 (IGNITION SIGNAL) Detects ignition signal With ignition switch ON (II): battery voltage
39 GRN SG3 (SENSOR GROUND) Sensor ground Less than 1.0 V at all times
40 BRN/YEL LG1 (LOGIC GROUND) Ground circuit for ECM/ PCMLess than 1.0 V at all times
41 BLU/WHT CMPA (CAMSHAFT POSITION (CMP) SENSOR
A) Detects CMP sensor A
signal
With engine running: pulses
42 RED/BLU KS (KNOCK SENSOR) Detects knock sensor signal With engine knocking: pulses
43 BLK/WHT NC (OUTPUT SHAFT (COUNTERSHAFT) SPEED
SENSOR) Detects output shaft
(countershaft) speed sensor
signalsWith ignition switch ON (II): pulses
With vehicle moving: about 5.0 V (pulses)
44 BRN/YEL LG2 (LOGIC GROUND) Ground circuit for ECM/ PCMLess than 1.0 V at all times
Terminal side of female terminals
08/08/21 14:13:36 61SNR030_110_0032
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PGM-FI System
Air Conditioning (A/C) Compressor Clutch Relay
Air Fuel Ratio (A/F) Sensor
Barometric Pressure (BARO) Sensor
Camshaft Position (CMP) Sensor BCrankshaft Position (CKP) Sensor
Engine Coolant Temperature (ECT) Sensor 1 and 2
Ignition Timing Control
Injector Timing and Duration
11-33
ZIRCONIA
ELEMENT
SENSOR
TERMINALS
HEATER
TERMINALS
O-RING
MAGNET
TERMINAL TERMINAL
O-RING
MAGNET
THERMISTOR O-RING TERMINAL
The programmed fuel injection (PGM-FI) system is a
sequential multiport fuel injection system.
When the ECM/PCM receives a demand for cooling
from the A/C system, it delays the compressor from
being energized, and enriches the mixture to assure
smooth transition to the A/C mode.
The A/F sensor operates over a wide air/fuel range. The
A/F sensor is installed upstream of the TWC, and sends
signals to the ECM/PCM which varies the duration of
fuel injection accordingly.
The BARO sensor is inside the ECM/PCM. It converts
atmospheric pressure into a voltage signal that
modifies the basic duration of the fuel injection
discharge.
CMP sensor B detects the position of the No. 1 cylinder
as a reference for sequential fuel injection to each
cylinder. The CKP sensor detects crankshaft speed and is used by
the ECM/PCM to determine the ignition timing, timing
for the fuel injection of each cylinder, and engine
misfire detection.
ECT sensors 1 and 2 are temperature dependent
resistors (thermistors). The resistance decreases as the
engine coolant temperature increases.
The ECM/PCM contains the memory for basic ignition
timing at various engine speeds and manifold absolute
pressures. It also adjusts the timing according to engine
coolant temperature and intake air temperature.
The ECM/PCM contains the memory for basic discharge
duration at various engine speeds and manifold
pressures. The basic discharge duration, after being
read out from the memory, is further modified by
signals sent from various sensors to obtain the final
discharge duration.
By monitoring long term fuel trim, the ECM/PCM
detects long term malfunctions in the fuel system and
sets diagnostic trouble codes (DTCs) if needed.
(cont’d)
08/08/21 14:13:37 61SNR030_110_0033
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Knock Sensor
Manifold Absolute Pressure (MAP) Sensor
Malfunction Indicator Lamp (MIL) Indication (In relation
to Readiness Codes) Mass Air Flow (MAF) Sensor/Intake Air Temperature
(IAT) Sensor
Output Shaft (Countershaft) Speed Sensor
A/T
11-34
Fuel and Emissions Systems
System Description (cont’d)
TERMINAL
PIEZO
CERAMIC
ELEMENT
DIAPHRAGM
O-RING TERMINAL HOT WIRE
SENSOR
O-RING
COLD WIRE
SENSOR IAT SENSOR
(THERMISTOR)
MAGNET O-RING
TERMINAL
The knock control system adjusts the ignition timing to
minimize knock.
The MAP sensor converts manifold absolute pressure
into electrical signals to the ECM/PCM.
The vehicle has certain readiness codes that are part of
the on-board diagnostics for the emissions systems. If
the vehicle’s battery has been disconnected or gone
dead, if the DTCs have been cleared, or if the ECM/PCM
has been reset, these codes are reset. In some states,
part of the emissions testing is to make sure these
codes are set to complete. If all of them are not set to
complete, the vehicle may fail the test, or the test
cannot be finished.
To check if the readiness codes are set to complete,
turn the ignition switch to ON (II), but do not start the
engine. The MIL will come on for 15 20 seconds. If it
then goes off, the readiness codes are complete. If it
flashes five times, one or more readiness codes are not
complete. To set each code, drive the vehicle or run the
engine as described in the procedures (see page 11-69). The mass air flow (MAF) sensor/intake air temperature
(IAT) sensor contains a hot wire sensor, a cold wire
sensor, and a thermistor. It is located in the intake air
passage. The resistance of the hot wire sensor, the cold
wire sensor, and the thermistor change due to intake air
temperature and air flow. The control circuit in the MAF
sensor controls the current to keep the hot wire at a set
temperature. The current is converted to voltage in the
control circuit, then output to the ECM/PCM.
This sensor detects countershaft speed.
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