ignition ISUZU TROOPER 1995 Workshop Manual

7A-88 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 23
THROTTLE POSITION SENSOR CONNECTOR OPEN
This DTC flashes the CHECK TRANS indicator and
sets
the BACKUP MODE.
Circuit Description:
• The Throttle Position Sensor (TPS) provides a
voltage signal that changes relative to the throttle
plate position. Signal voltage between connector
C-91 terminals C5 and C6 will vary from about 0.4
at
idle to about 4.6 volts at wide open throttle.
• The Engine Control Module (ECM) also receives
this signal. This TPS is a variable resistance with
one side (connector E-5 terminal 2) connected
only to the ECM connector to have the 5 volts
supply voltage. The other side (connector E-5
terminal 1) is connected to the Transmission
Control Module (TCM) (floating ground) and the
ECM (ground). The "middle" (the wiper) (con­
nector E-5 terminal 3) is connected to the TCM
and
the ECM.
• The TCM monitors output voltage from the TPS
and
determines fuel delivery based on throttle
valve angle (driver demand).
• This TPS is an electrical component and must not
be soaked in any liquid cleaner or solvent, as
damage may result.
r--...... ..,
I
I
I
TPS INPUT
I GROUND I l ___ _J
C-91
l C5
I
I
C6
BLU/ORN
BLU/RED
BLU/RED
BLKJWHT
A1 ,S.-1_ 06
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions:
G) This detects the terminals C5 and C6 open or
the connector E-5 open.
® Throttle value opening > 42%.
® Engine Speed < 2200 RPM.
@ Vehicle Speed <3 Km/h.
@ No DTC: Engine Speed DTC13, Output Speed
DTC11.
Downshift Protection DTC62.
® Only with Selector Lever in Park or Neutral.
(]) The detection is authorized only during 6
seconds
after the engine is cranked.
® The conditions need to be present for at least
3 seconds.
• Action after the detection time: BACKUP MODE.
• Recovery conditions: To recover do an IGNITION
CYCLE.
TO COOLANT TEMPERATURE SENSOR
BLKJWHT
.,£2_ ~2 C-2
H-5 BLUIORN
9
2
BLU/
H- 5
RED E-5
10 3 .... ,'
1
H-5 BLKJWHT
11
E-5
E-5
THROTILE
POSITION
SENSOR
(TPSI
TRANSMISSION CONTROL MODULE (TCM)
15 VOLT -TPS -GROuNOl ENGINE
I REFERENCE INPUT 1 CONTROL l MODULE I (ECM)
L--------J

AUTOMATIC TRANSMISSION (4L30-E) 7 A-89
DIAGNOSTIC TROUBLE CODE (DTC) 23
THROTTLE POSITION SENSOR CONNECTOR OPEN
Check Engine Control Module (ECM)
DTC.
IF: DTC on Throttle Position Sensor (TPS) exists:
I
Check diagnosis of ECM and repair. • Install scan tool GOTHROUGH TECH1 CONNECTION.
• Ignition switch ON, engine not running.
• Selector lever position "P". • Select FO: DATA LIST: "TPS SIGNAL". IF: TECH 1 DISPLAY approx. 2.5 volts whatever the throttle valve position:
IF: TPS connector E-5 on I the engine is open: DTC 23 is intermittent. GOTO INTERMITTENT
CONDITIONS.
~
NO
Repair. j
• Ignition switch OFF. Disconnect connector C-91. Connect ohmmeter between connector C-91 terminals C5 and C6. If open circuit: • Check for an open between connector C-91 terminal C5 to connector E-5 terminal 3 with a simultaneous open of the terminal C6 to the connector E-5 terminal1. This faulty connection can be at the intermediate connector H-5 terminal 10 and 11.
• Repair. If not OK: Ignition switch OFF. Disconnect sensor.
• Connect ohmmeter between sensor terminals 3 wiper and 1 low side. If resistance between TPS terminal 3 and 1 does not change when the throttle valve angle is changed: Replace TPS.

7 A-90 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 25
SUPPLY VOLTAGE TOO LOW
This DTC flashes the CHECK TRANS indicator and
sets the BACKUP
MODE.
Specification decreases with the transmission
oil temperature:
Circuit Description:
-40°C (-40°F) = S.7 volts
90°C (194°F) = 9.0 volts
150°C (304°F) = 9.2 volts The ignition voltage of Transmission Control
Module (TCM) terminals A7 and AS is monitored by
the TCM and when the voltage is too low (approx. 9
volts) the DTC25 is stored and the BACKUP MODE
is set.
@ The condition needs to be present for at least
1 second
• Action after the detection time: BACKUP MODE
Diagnostic Aids:
• This Diagnostic is an electrical test done by the
TCM.
• Recovery conditions: To recover, the ignition
voltage must be higher than specification.
Specification decreases
with the transmission oil
temperature:
-40°C (-40°F) = 9.2 volts
90°C (194°F) = 9.5 volts
150°C (304°F) = 9.6 volts
• Detection conditions:
CD Ignition voltage measured between TCM
terminal A7 or AS and ground C1 is lower
than specification .
. · fU I
I '
f:L;~soA L., ____ J
RELAY & FUSE BOX
1--, {)-:,.--____..J BATTERY
l
T
L __ I
r
I C-14 C-8 I I 15A 15A FUSE -__ + _ j BOX
H-13t 3
H-7 'x~.~~'---7 r ]_-
GRN/WHT
BATTERY I GROUND INPUT IGNITION I INPUT I
L-----------TRANSMISSION
CONTROL MODULE
(TCM) IGN.SW.
RED/WHT
C-1 C-1 C-2
A6 B1 C16
r -;ATTERV INPUT-l
I
I l _____ j
ENGINE
CONTROL MODULE
(ECM)
I I
I-_j GENERATOR

AUTOMATIC TRANSMISSION (4L30-E) 7A-91
DIAGNOSTIC TROUBLE CODE (DTC) 25
SUPPLY VOLTAGE TOO LOW
• Ignition switch ON. Engine OFF.
• Connect voltmeter between B+ and B-terminals of battery. IF: Display greater than 9 volts:
•
Engine running.
• Connect voltmeter between B+ and B-terminals of battery.
IF: display between 13 and 16 volts?
• Ignition
switch OFF. • Disconnect Transmission Control Module (TCM)
connector C-90 and C-91. • Ignition switch ON. Engine OFF.
• Connect voltmeter between connector C-90 terminal A7 and connector C-91 terminal C1. IF: Display greater than 9 volts:
Check for faulty connection and if OK.
GOTO INTERMITTENT CONDITIONS.
Check fuse and wire to A7, AS and C1 for
open circuit.

7 A-92 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 26
SUPPLY VOLTAGE TOO HIGH
This DTC flashes the CHECK TRANS indicator and
sets the
BACKUP MODE.
Circuit Description:
The ignition voltage of Transmission Control
Module (TCM) terminals A7 and AS is monitored by
the TCM and when the voltage is too high (approx.
16 volts) the
DTC26 is stored and the BACKUP
MODE is set.
Diagnostic Aids:
• This Diagnostic is an electrical test done by the
TCM.
BATTERY
I FUSE I
L..-FL·1~A-I
RELAY & FUSE BOX
r
I
I
H-7
GRN/WHT
H-11 BLK/ORN
• Detection conditions:
CD Ignition voltage measured between TCM
terminal
A7 or AS and ground C1 is higher
than 16 volts.
® The condition needs to be present for at least
1 second.
• Action after the detection time : BACKUP MODE
• Recovery conditions: To recover, ignition voltage
<16
volts.
-F~;K--:
Fl:.-2 F•. L·3 50A 3DA 1
-_I
1--1 (1-,,--...----J L __ I
IGN.SW.
C-8 I 15A FUSE _ j BOX
3
RED/WHT
RELAY & FUSE BOX
r 1
I-..J GENERATOR
1
,-----------e-T ~:>( BLK/BLU
~ I RED/GRN
1
C-91 ~p:!_ C1 !-~ _ _ ~8-_ A7 C-90
C-1 C-1 C-2
I - - - -BATTER~ - - - -I
I GROUND INPUT IGNITION I INPUT l ___________ l
TRANSMISSION
CONTROL MODULE
(TCM)
_ A6 _B1_ C16
r BATTERY INPUT I I I
l _____ j
ENGINE
CONTROL
MODULE (ECM)

AUTOMATIC TRANSMISSION (4l30·E) 7 A-93
DIAGNOSTIC TROUBLE CODE (DTC) 26
SUPPLY VOLTAGE TOO HIGH
• Ignition switch ON. Engine OFF.
• Connect voltmeter between B+ and B-terminals of battery. IF: Display greater than 16 volts:
•
Engine running. • Connect voltmeter between B+ and B-terminals of
battery. IF: Display between 3 to 16 volts:
• Ignition
switch OFF. • Disconnect Transmission Control
Module (TCM) connector C-90 and
C-91. • Ignition switch ON. Engine ON.
•
Connect voltmeter between
connector C-90 terminals A7 and
connector C-91 terminal C1. IF: Display higher than 16 volts:
Check regulator. The problem is
intermittent.
GOTO
INTERMITIENT CONDITIONS.

7 A-94 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 31
SOLENOID 1-2/3-4 SHORT TO GROUND OR OPEN
This DTC flashes the CHECK TRANS indicator and
sets
the BACKUP MODE.
Circuit Description:
• The 1-2/3-4 solenoid is a simple ON/OFF solenoid
located
in the main case valve body. The
solenoid is the normally closed-type. In second
or third gear the Transmission Control Module
(TCM) energizes the solenoid to open a fluid inlet
port. When the port is open, fluid pressure
actuates the
shift valve.
•
The solenoid is activated by a current. This
current is produced by applying a voltage to one
side (the High side) and a
ground to the other
side (Low side).
• The High Side Driver (HSD) is a circuit of the TCM
that acts as a switch between the solenoids and
the
supply voltage. The High side of the solenoid
is permanently supplied with voltage, except in
BACKUP
MODE or when ignition is OFF the HSD
is turned OFF.
• The TCM continually monitors the solenoid
connection to its Low Side Driver (LSD) for either
low or high voltage. The LSD is a circuit of the
TCM that acts as a switch between the solenoid
and ground. When the solenoid is commanded
ON the TCM is switching the solenoid to ground.
r----C-90 BRN/RED H-10
• There are two tests of the LSD: When the engine
is cranked (DTC82) and when the ignition is
turned ON (DTC31 ).
• When the ignition is turned ON, and before the
engine is cranked, the TCM activates the shift
solenoids (1-2/3-4, 2-3 and Band) to check for
short circuits or open circuits. To do so the gear
is set
to 4th, 3rd, 1st, 1st with band apply, 4th
with no HSD. Each one of the 5 tests requires
0.15 second. If the engine is cranked before the
end of all tests, the remaining tests are not done.
Diagnostic Aids:
• This Diagnostic is an electrical test done by the
TCM.
• Detection conditions:
CD The solenoid low side connected to TCM
terminal A2 is shorted to ground or open.
® The test is only done when ignition is ON.
® Engine Speed < 480 RPM (not cranked) and
Output Speed = 0 RPM.
@ The conditions need to be present for 0.15 to
1.03 second after ignition switch ON.
•
Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
I GROUND I A2 3(D)j,. M-7 ( 16
I I
I I
I I
I
I
I
I 1·2/3·4
SHIFT C-91
I SOLENOID I j> BRN/WHT
I
CONTROL I I C12
I GROUND { I ? C1
BLK/ORN
J ) BLK/BLU
L..---D1 TRANSMISSION
CONTROL MODULE
(TCM)
H-10 ( 10
~ --r ----r ----1----~ ~~~~~~~~ION
I I
1m4 rnH SHIFT SHIFT II SOLENOID II SOLENOID
-y
-_........_ __________
--41Clf M-7
II
SAND I APPLY SOLENOID I
I
I
---.J
•

AUTOMATIC TRANSMISSION (4L30-E) 7 A-95
DIAGNOSTIC TROUBLE CODE (DTC) 31
SOLENOID 1-2/3-4 SHORT TO GROUND OR OPEN
• Ignition switch OFF. • Disconnect Transmission Control Module (TCM) connector C-90 and C-91.
•
Connect ohmmeter between connector C-91 terminal C12 and connector C-90 terminal A2. IF: Display between 17.5 and 18.5 ohms?
• Connect ohmmeter between connector C-90 terminal A2 and connector C-91 terminal C1 (TCM ground).
IF: Short circuit:
• Check for faulty connector or wiring between terminal A2
and ground.
• Repair.
The
problem is intermittent. GOTO INTERMITTENT CONDmONS.
Check for an open circuit between connector C-90 terminal A2 and connector C-91 terminal C12.
IF: Wiring problem?
I Repair.
• Disconnect 1-2/3-4 solenoid connector. • IF: Ohmmeter displays between 17.5 and 18.5
ohms on the 1-2/3-4
solenoid terminals:
The problems is
intermittent. GOTO INTERMITTENT
CONDITIONS.

7 A-96 AUTOMATIC TRANSMISSION (4l30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 32
SOLENOID 2-3 SHORT TO GROUND OR OPEN
This DTC flashes the CHECK TRANS indicator and
sets
the BACKUP MODE.
Circuit Description:
• The 2-3 solenoid is a simple ON/OFF solenoid
located in the main case valve body. The
solenoid is the normally open-type. When the
port is open, fluid pressure actuates the shift
valve. In first or second gear the Transmission
Control Module (TCM) energizes the solenoid to
close a fluid inlet port.
• The solenoid is activated by a current. This
current is produced by applying a voltage to one
side (the High side) and a ground to the other
side (Low side). .
• The High Side Driver (HSD) is a circuit of the TCM
that acts as a switch between the solenoids and
the supply voltage. The High side of the solenoid
is permanently supplied with voltage, except in
BACKUP
MODE or when ignition is OFF the HSD
is
turned OFF.
•
The TCM continually monitors the solenoid
connection to its Low Side Driver (LSD) for either
low or high voltage. The LSD is a circuit of the
TCM that acts as a switch between the solenoid
and ground. When the solenoid is commanded
ON the TCM is switching the solenoid to ground.
r---_ c-9o
BRN/BLK H-10
I GROUNDJ) (( A3 2
• There are two tests of the LSD: When the engine
is cranked (DTC82) and when the ignition is
turned ON (DTC32).
• When the ignition is turned ON, and before the
engine is cranked, the TCM activates the shift
solenoids (1-2/3-4, 2-3 and Band) to check for
short circuits or open circuits. To do so the gear
is set to 4th, 3rd, 1st, 1st with band apply, 4th
with no HSD. Each one of the 5 tests requires
0.15 second. If the engine is cranked before the
end of all tests, the remaining tests are not done.
Diagnostic Aids:
• This Diagnostic is an electrical test done by the
TCM.
• Detection conditions:
CD The solenoid low side connected to TCM
terminal A3 is shorted to ground or open.
@ The test is only done when ignition is ON.
@ Engine Speed < 480 RPM (not cranked) and
Output Speed = 0 RPM.
@ The conditions need to be present for 0.15 to
0.88 second after ignition switch ON.
•
Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover, do an IGNITION
CYCLE.
1(A) '1 M-7
,.... --r ----r ----
1 - -- -
AUTOMATIC I
I TRANSMISSION
I I
I I
I I
I BAND I APPLY I SOLENOID!
I
I
I I
I
I
I
I
I I
I I
I 2·3 I SHIFT C-91 H-10
I SOLENOID I
( BRN/WHT (
I
CONTROl I I C12 10
I GROUND { I ? C1
BLK/ORN
j) BLK/BLU L.---D1
1-2/3-4 2-3
II
SHIFT
II
SHIFT
II SOLENOID SOLENOID
-"--------------..J
TRANSMISSION
CONTROL
MODULE (TCM)
•

AUTOMATIC TRANSMISSION (4L30-E) 7 A-97
DIAGNOSTIC TROUBLE CODE (DTC) 32
SOLENOID 2-3 SHORT TO GROUND OR OPEN
• Ignition switch OFF. • Disconnect Transmission Control Module
(TCM) connector C-90 and C-91.
• Connect
ohmmeter between connector C-91 terminal C12 and connector C-90 terminal A3. IF: Display between 17.5 and 18.5 ohms?
• Connect ohmmeter between connector C-90 terminal A3 and connector C-91 terminal C1 (TCM ground).
IF: Short circuit:
• Check for faulty connector or wiring between terminal A3
and ground.
Repair.
The
problem is intermittent. GOTO INTERMITTENT
CONDITIONS.
Check for an open circuit between connector C-90 terminal A3 and connector C-91 terminal C1.
IF: Wiring problem?
•
Disconnect 2-3 solenoid connector. IF: Ohmmeter displays between 17.5 and 18.5 ohms on the 2-3 solenoid terminals:
The problems is
intermittent. GOTO INTERMITTENT
CONDITIONS.