ECT sensor HONDA CIVIC 2003 7.G Repair Manual

11.
13.
'10. l\4easure voltage between ECM connector terminal
A7 and body ground,
ECM CONNECTOR A 13lPI
Wire side ot female terminals
ls there about 5 V?
YES-Repair open in the wire between the ECM(A7) and the CKP sensor. t
NO-Go to step 11.
Turn the ignition switch OFF.
Disconnect ECM connector A (31P)
Check for continuity between ECM connector
terminal 47 and body ground.
ECM CONNEfiOR A (31P)
Wire side of female terminals
ls there continuity?
YES-Repair short in the wire between the ECM(A7) and the CKP sensor. t
NO Update the ECM if it does not have the latest
software. or substitute a known-good ECI\4, then
recheck (see page 1 1-6). lf the symptom/indicationgoes away with a known-good ECM, replace the
original ECM.t
11-79

PGM-FI System
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DTG Troubleshooting (cont'dl
DTC Pl157: Ay'F Sensor (Sensor 1) Range/
Performance Problem
1. Resetthe ECIM (see page 11-4).
2. Start the engine.
ls DTC Pl157 indicated?
YES-Go to step 3.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the Ay'F sensor (Sensor 1 ) and at the ECN4.I
Turn the ignition switch OFF.
Disconnect the Ay'F sensor (Sensor 1) 4P connector
and ECM connector A (31P).
Connect A,/F sensor (Sensor 1) 4P connector
terminals No. 1 and No. 2 with a jumper wire.
A/F SENSOR (SENSOR 1) 4P CONNECTOR
AFS+ {BLU)
Wire side of female terminals
3.
JUMPER WIRE
11-84
L
6. Check for continuity between ECM connector
terminals 46 and A16.
ECM CONNECTOR A {3IP)
Wire side of female terminals
ls there continuity?
YES Go to step 9.
NO Go to step 7.
Connect A/F sensor (Sensor 1) 4P connecror
terminal No. 1 to body ground with a jumper wire.
A/F SENSOR {SENSOR 1I 4P CONNECTOR
7.
Wire side ot female terminals

8. Check for continuity between ECM connector
terminals 46 and body ground.
ECM CONNECTOR A 131P}
Wire side ol lemale terminals
ls there continuity?
YES-Repair open in the wire between the Ay'F
sensor (Sensor 1) and the ECM (416).1
NO-Repair open in the wire between the Ay'F
sensor (Sensor 1) and the ECM (46).1
Substitute a known-good Ay'F sensor (Sensor 1) and
recheck.
ls DTC P1157 indicated?
YES- Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 1 1-6). if the symptom/indication
goes away with a known-good ECM, replace the
original ECM. !
NO- Replace the Ay'F sensor {Sensor 1). !
9.
DTC Pl158: Ay'F Sensor (Sensor 1) AFS -
Terminal Low Voltage
1. Resetthe ECM (see page 11-4).
2. Start the engine.
ls DTC P1158 indicated?
YES Go to step 3.
NO-lntermittent failure, system is OK at this time
Check for poor connections or loose termanals at
the Ay'F sensor (Sensor 1) and at the ECIM I
3. Turn the ignition switch OFF.
4, Disconnectthe Ay'F sensor (Sensor 1) 4P connector,
and ECM connector A (31P).
5. Check for continuity between ECM connector
terminal 416 and body ground.
ECM CONNECTOR A (31P)
ls thete continuity?
YES-Repair shon in the wire between the A,/F
sensor (Sensor 1)and the ECM (A16).1
NO Go to step 6.
'cont d)
Wire side oJ female terminals
11-85

PGM-FI System
(
a
DTC Troubleshooting (cont'd)
6. Substitute a known-good Ay'F sensor (Sensor 1)and
recheck.
Is DTC P1158 ind icated?
YES Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 1 1-6). if the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
NO- Replace the Ay'F sensor (Sensor 1). t
11-86
DTC Pl159: A,/F Sensor (Sensor 1) AFS +
Terminal Low Voltage
1. Resetthe ECM (see page 11-4).
2. Sta rt the engine.
ls DTC P1159 ind icated?
YES-Go to step 3.
NO-lntermiftent failure. system is OK at this time.
Check for poor connections or loose terminais at
the A,/F sensor (Sensor 1) and at the ECM.I
3. Turn the ignition switch OFF.
4. Disconnect the Ay'F sensor (Sensor 1) 4P connector
and EcM connector A (31P).
5. Check for continuity between ECM connector
terminal 46 and body ground.
ECM CONNECTOR A {31PI
Wire side of female terminals
ls there continuity?
YES-Repair short in the wire between the Ay'F
sensor (Sensor 1) and the ECM (AO).I
NO Go to step 6.

PGM-FI System
DTC Troubleshooting (cont'dl
DTC Pl163: Ay'F Sensor (Sensor 1 ) SlowResponse
NOTE: lf DTC P1162 is stored at the same time as DTC
P1163. troubleshoot DTC P1162 first, then recheckfor
DTC P1163.
1. Reset the ECM (see page 1 1-4).
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on.
3. Test-drive under the following conditions:
. 55 mph (89 km/h) steady speed' Transmission in sth gear' Until the Ay'F sensor readiness code or
Temporary DTC Pl163 comes on
4. Check for a Temporary DTC with the scan tool.
ls Temporary DTC P 1163 indicated?
YES Replace the Ay'F sensor (Sensor 1).I
NO Intermittent failu re, system is OK at this time.
Check for poor connections or loose terminals at
the A'lF sensor (Sensor 1 ) and at the ECM. t
11-88
DTC Pl164: A,/F Sensor (Sensor 1) Circuit
Range/Performance Problem
1. Resetthe ECI\4 (see page 1t-4).
2. Start the engine. Holdtheengineat3,000 rpmwith
no load (in neutral) until the radiator fan comes on,
3. Test-drive in 3rd gear. Starting at 1,600 rpm,
accelerate using wide open throttle for at least
5 seconds. Then decelerate for at least 5 seconds
with the throttle completely closed until the A,/F
sensor readiness code is set to complete or
Temporary DTC P1 164 comes on.
4. Check for a Temporary DTC with the scan tool.
ls Temporary DTC P1164 indicated?
YES- Replace the A,,/F sensor (Sensor 1). I
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the Ay'F sensor relay, at the Ay'F sensor (Sensor 1),
and at the EcM.l

DTC Pl166: Ay'F Sensor (Sensor 1) Heater
Circuit Malfunction
1. Resetthe ECM (see page 11-4).
2. Start the engine.
ls DTC P1166 indicated?
YES-Go to step 3.
NO-lntermittent failure, system is OK at this lime.
Check for poor connections or loose terminals at
the Ay'F sensor relay, the A,/F sensor (Sensor 1), and
the EcM. !
3. Check the following fuse:
. No. 14 OPTION (30A)fuse in under-hood fuse/
reray Dox.. No. 2*B LAF (Ay'F) HEATER (20A) fuse in under-
dash fuse/relay box.. No. 4 ACG (10A) in underdash fuse/relay box.
Are any of the fuses blown?
YES Repair short in the wire between the Ay'F
sensor relay and the fuses.I
NO Go to step 4.
4. Measure voltage between ECM connector
terminals A1 and A24. 30 seconds after the ignition
switch is turned ON (ll).
ECM CONNECTOR A I31P)
Wire srde of lemale terminals
Is therc battery voltage?
YES-Update the ECM if it does not have the latest
soflware, or substitute a known-good ECM. then
recheck (see page 1 1-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
NO-Go to step 5.
5. Measure voltage between ECM connector
terminals A22 and A24.
ECM CONNECTOR A {31P}
Wire side of female terminals
ls there battery voltage?
YES Go to step 6.
NO-Go to step 10.
6. Turn the ignition switch OFF.
7. Disconnect ECM connector E (31P).
8. Turn the ignition switch ON {ll).
(cont'd)
11-89

PGM-FI System
DTC Troubleshooting (cont'dl
9. Connect ECM connector terminal EStobodyground with a jumper wire, then measure voltage
between ECM connector terminals A1 and 424.
ECM CONNECTORS
Wire side of female terminals
ls there battery voltage?
YES- Update the ECM if it does not have the latest
soflware, or substitute a known-good ECM, then
recheck (see page 1 1-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM. t
NO Repair open in the wire between the Ay'F
sensor (Sensor 1) and ECM (A1). t
Turn the ignition switch OFF.
Disconnecl the ECfM connector A (31P) and the Ay'F
sensor (Sensor 1) 4P connector.
Check for continuity between the Ay'F sensor(Sensor 1) 4P connector terminal No. 3 and bodyground.
A/F SENSOR (SENSOR 1) 4P CONNECTOR
10.
11.
12.
11-90
Wire side ot Iemale terminals
t5.
14.
ls there continuity?
YES Repair short in the wire between the A|/F
sensor relay, A,/F sensor {Sensor 1) and ECM
lA22J.a
NO Go to step 13.
Turn the ignition switch ON (ll).
Measure voltage between ECM connector
terminals E8 and A24.
ECM CONNECTORS
E {31 P)
a {31 P)
Wire side of female terminals
ls there battety voltage?
YES-Repair open in the wire between the ECM(A22) and the IVF sensor (Sensor 1). I
NO-Go to step 15.
Check for continuity in the wires between the Ay'F
sensor and the fuses.
ls there continuity?
YES-The wires are OK. Replace the A,/F sensor
relay.l
NO Repair open in the wire between the Ay'F
sensor relay and the fuses.l

DTC Pl167: Ay'F Sensor (Sensor 1) Heater
Circuit Malfunction
NOTE: lf DTC P1162 is stored at the same time as DTC
P1167, troubleshoot DTC P1162 first, then troubleshoot
DTC P1167.
1. Resetthe ECI\4 (see page 11-4)
2. Start the engine. Wait for at least 80 seconds.
ls DTC P01167 ind icated?
YES Go to step 3.
NO-lntermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the Ay'F sensor relay, at the Ay'F sensor (Sensor 1),
and at the ECM.I
Turn the ignition switch OFF.
Disconnect the A,/F sensor 4P connector and ECM
connector A (31P).
Connect the Ay'F sensor (Sensor 1) 4P connector
terminals No. 2 and No. 1 with a jumper wire.
?
5.
A/F SENSOR (SENSOR 1)4P CONNECTOR
JUMPER WIRE
Wire side offemale terminals
6. Check for continuity between ECM connector
terminals ,46 and 416.
ECM CONNECTOR A {31P)
AFS- {RED)
trTzTil,ils llt9
t82C21
l?rlzsIels
AFSIRED/YEL)
Wire side of lemale terminals
ls thete continuity?
YES-Replace the A/F sensor (Sensor 1).1
NO-Repair open in the wire between the Ay'F
sensor (Sensor 1 ) and the ECM (46 or A16).I
11-91

3.
4.
5.
6.
DTC Pl361: Camshaft Position (CMP) Sensor
B (TDC Sensor) Intermittent Interruption
DTC Pl362: Camshaft Position (CMP) Sensor
B (TDC Sensor) No Signal
1. Reset the ECM (see page 11-4).
2. Start the engine.
ls DTC P1361 and/or P1362 indicated?
YES Go to step 3.
NO- Intermittent failure. system is OK at this time.
Check for poor connections or loose terminals at
the CMP sensor B (TDC sensor) and at the ECM.I
Turn the ignition switch OFF.
Disconnectthe CMP sensor B (TDC sensor) 3P
connector.
Turn the ignition switch ON (ll).
Measure voltage between CMP sensor B (TDC
sensor) 3P connector terminal No. 3 and body
grouno.
CMP SENSOR B {TDC SENSOR) 3P CONNECTOR
{YEL/BLK}
Wire side ol temale terminals
ls there battety voltage?
YES Go to step 7.
NO-Repair open in the wire between the PGM-Fl
main relay 1 and the CMP sensor I (TDC sensor).I
IGP
123
7. l\4easure voltage between CMP sensor B {TDC
sensor) 3P connector terminal No. 1 and body
ground.
CMP S€NSOR 8 ITDC SENSOR) 3P CONNECTOR
Wlre s de ollemaleterminals
ls there about 5 V?
YES-Go to step 8.
NO-Go to step 10.
8. Measure voltage between Cl\ilP sensor B (TDC
sensor) 3P connector terminals No. 2 and No, 3.
CMP SENSON B llOC SENSOfi) 3P CONNECTOF
Wire s de olfema etefminals
ls there battery voltage?
YES-Go to step 9.
NO Repair open in the wire between the CMP
sensor B (TDC sensor) and G101.1
9. Substitute a known-good CMP sensor B (TDC
sensor) and recheck.
ls DTC P1361 and/or P1362 indicated?
YES Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
NO Replace the original CMPsensorB(TDC
sensor).1
(cont'd)
11-95

PGM-FI System
DTC Troubleshooting (cont'd)
10. Measure voltage between ECI\4 connectorterminal
A26 and body ground.
ECM CONNECTOR A (31P)
12345617I
011 121./61,/ 18I2C2l
23 2421 m30
TDC {GRN}
Wire side oI temale terminals
ls there about 5 V ?
YES - Repair open in the wire between the ECM(426) and CMP sensor B (TDC sensor).1
NO-Go to step 11.
Turn the ignition switch OFF.
Disconnect ECIM connector A (31P)
Check for continuity between ECM connector
terminal 426 and body ground.
ECM CONNECTOR A {31PI
Wire side of female terminals
ls there continuity?
YES Repair short in the wire between the ECM(426) and the CMP sensor B (TDC sensor).1
NO Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
11.
12.
11-96
DTC Pl607: Malfunction in ECM Internal
Circuit
1. Resetthe EC|\il lsee page 11-4).
2, Turn the ignition switch ON (ll), and wait for
40 seconds.
ls DTC P 1607 indicated?
YES Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11 6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
NO Intermittent failure, system is OK at this time.
A low battery can cause this problem . Ask the
customer if there has been any recent trouble
starting the engine.l
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