sensor ISUZU TROOPER 1995 Workshop Manual

AUTOMATIC TRANSMISSION (4L30-E) 7A-85
DIAGNOSTIC TROUBLE CODE (DTC) 21
THROTTLE POSITION SENSOR SHORT TO PLUS OR OPEN
Check Engine Control Module (ECMI DTC.
IF: DTC on Throttle Position Sensor (TPSI exists:
Check diagnosis of ECM and repair. • Install scan tool GOTHROUGH TECH1
CONNECTION. • Ignition switch ON, engine not
running.
• Selector lever position up•.
• Select FO: DATA LIST: "TPS SIGNAL•. IF: TECH1 DISPLAY more than 4.9 volts:
• Connect
voltmeter between connector C-91 terminal C5 and TPS ground
terminal C6. IF: If you have more than 4.9 volts:
• Check
for a short to voltage or open circuit between connector C-91 terminal C5 and connector E-5 terminal 3.
This faulty connection can be at intermediate connector H-5 terminal 10.
The short to voltage only can be at the ECM connector C-2 terminal D6.
• Repair If not OK: Ignition switch OFF. Disconnect connector C-91.
• Connect ohmmeter between connector C-91 terminal C5 and C6. • Check ifthe circuit is open.
• Repair. If not OK: 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.
DTC 21 is intermittent.
GOTO INTERMITTENT CONDmONS.

7A-86 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 22
THROTTLE POSITION SENSOR SHORT TO GROUND
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
r---.,
I
I
I
I
I
I
TPS INPUT
I GROUND I L ___ .J
C-91
T C5
I
I
C6
BLU/ORN
BLU/RED
BLU/RED
BLK!WHT
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.
Diagnostic Aids:
• This Diagnostic is an electrical test done by the
TCM.
• Detection conditions:
G) This detects a TPS wiper short to TCM ground
(except certain conditions) and wiper short to
TPS low. This also detects a TPS low open.
® Voltage between connector C-91 terminals C5
and C6 < 0.2 volts.
@ The condition needs to be present for at least
0.5
seconds. Note: during the detection time
the TCM reads "0% (idle)".
• Action after the detection time: BACKUP MODE.
•
Recovery conditions: To recover when voltage >
or= to 0.2 volts and do an IGNITION CYCLE.
H-5 BLU/ORN
9
BLU/
H- 5 RED E-5 _. 10 3 TO
COOLANT TEMPERATURE
1 SENSOR, H-5 BLK!WHT
BLK!WHT
11
2
:
E-5
E-5
THROTTLE POSITION
SENSOR
(TPS)
TRANSMISSION CONTROL MODULE
(TCM)
A1 S-1_ D6 ._£2-~2_, C-2
lsvo"Lr -"TP5 -"GRouNDl !REFERENCE INPUT 1
I I t_ ________ J
ENGINE
CONTROL MODULE
(ECM)

AUTOMATIC TRANSMISSION (4L30-E) 7 A-87
DIAGNOSTIC TROUBLE CODE (DTC) 22
THROTTLE POSITION SENSOR SHORT TO GROUND
Check Engine Control Module (ECM) DTC.
IF: DTC on Throttle Position Sensor (TPS) exists:
Check diagnosis
of ECM and repair. • Install scan tool GOTHROUGH TECH1 CONNECTION. • Ignition switch ON, engine not running. • Selector lever position uP".
• Select FO: DATA LIST: "TPS SIGNAL". IF: TECH1 DISPLAY less than 0.2 volts:
• Connect voltmeter between connector C-91 terminal C5 and TPS ground
terminal C6.
IF: If you have less than 0.2 volts:
• Check for a short to ground between connector C-91 terminal C5 and
connector E-5 terminal 3. This faulty connection can be at the intermediate connector H-5 terminal 10.This faulty connection can be at the ECM connector C-2 terminal D6.
• Repair If not OK: Ignition switch OFF. Disconnect sensor connector E-5. • 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.
DTC 22 is intermittent. GOTO INTERMITTENT
CONDITIONS.

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.

7A-120 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC
TROUBLE CODE (DTC) 51
ENGINE COOLANT SWITCH SHORT TO GROUND, PLUS OR OPEN
This DTC does NOT flash the CHECK TRANS
indicator and does NOT set the BACKUP MODE.
Circuit Description:
• The Engine Coolant Temperature is measured by
a sensor in the coolant system. This information
is used by the Engine Control Module (ECM) for
the engine. The ECM provides the information:
Engine Warm to the Transmission Control
Module (TCM) when the ECM measures a
temperature
higher than 70°C (158°F).
• The information is provided using a wire
between the ECM terminal A9 and the TCM
terminal D14. When the engine is warm the ECM
connects its terminal A9 to ground using a Low
Side Driver. When the engine is Cold the ECM
lets this wire open and the TCM pulls it up to 5
volts.
•
When Ignition is ON and Engine is OFF: the ECM
always sends the information "engine cold" even
if the engine is warm. The information is valid
only when the engine is ON.
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions of engine always cold:
CD Engine! seen as cold: wire short to voltage or
open.
@ Transmission Oil Temperature >150°C (302°F)
or more than 20 minutes since last ignition
cycle.
@ Detection conditions need to be present for at
least 25 seconds.
• Detection conditions of engine always warm:
CD Engine! seen as warm: wire short to ground.
@ Transmission Oil Temperature< ooc (32°F).
@ Without problem on Transmission Tem­
perature sensor then:
voltage on AfT Oil
Temperature sensor <4.74 V.
@ Detection conditions need to be present for at
least 6 seconds.
• Action after the detection time: No action.
• Recovery conditions: To recover, Engine Coolant
Temperature change information need to be
present
for more than 6 seconds.
r - - - -C·91 BRN C-1 r - - - -
I ~~~ENT I f,_D_1_4 __ ~.!__--------~-: I ~NGt~~ I
1 teMPERAtuRE I 1
1 t=R'ATJJRel
I INPUT I I I OUTP\:IT l
I 1
1 I I
I I I H-11 I l
I
GROUND 11 ? C1 BLKJORN ~9 I I I I BLKJBLU ( 1 I > o1 I
I I 1 I I
I I I I
~---J ~---J TRANSMISSION ENGINE
CONTROL CONTROL
MODULE
(TCM) MODULE (ECM)
•

7A-122 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 52
KICK DOWN ALWAYS ON OR SHORT TO GROUND
This DTC does NOT flash the CHECK TRANS
indicator and does
NOT set the BACKUP MODE.
Circuit Description:
• When the driver presses the accelerator pedal
down fully, the kick down switch closes, sending
a
ground signal to the Transmission Control
Module (TCM).
• This information is used to do shifts with a high
Engine Speed RPM.
• When the kick down switch is closed the Throttle
Position Sensor (TPS) is already at 100%.
Diagnostic Aids:
• This diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
1
I
I
I
I
----
KICK DOWN SWITCH INPtit
C-90 LT BLU
85
C-91 H-11
• Detection conditions:
G) Kick down switch ON (short to ground) and
TPS
<70%.
@ No malfunction: TPS short to voltage or
ground (DTC21 and DTC22).
@ The conditions need to be present for at least
1 second.
•
Action after the detection time: Kick Down
information not taken into account.
• Recovery conditions: To recover, Kick Down
needs
to be seen as OFF during detection time.
H-7
'}-1 KICK DOWN I SWITCH
I { I ? BLKJORN ~
I GROUND II C1 BLKJBLU :q ) D1 < I ____ , 1
TRANSMISSION
I
l~··j1
1 r::o
CONTROL
MODULE ITCM)
•

AUTOMATIC TRANSMISSION (4L30-E) 7A-123
DIAGNOSTIC TROUBLE CODE (DTC) 52
KICK DOWN ALWAYS ON OR SHORT TO GROUND
IF: DTC 23 Throttle Position Sensor (TPS) connector
• Ignition switch ON. Engine OFF.
• Accelerator pedal not depressed. • Connect a voltmeter between connector C-90
terminal B5 and connector C-91 terminal C1 (TCM
ground).
IF: Display approx. 0 volts:
•
Check the wires and connector
and the switch to detect the
short to ground.
• Repair. The
problem is
intermittent. GOTO INTERMITTENT
CONDITIONS.

AUTOMATIC TRANSMISSION (4l30-E) 7 A-125
DIAGNOSTIC TROUBLE CODE (DTC) 53
MODE SWITCH IN P OR N OR R BAD POSITION
IF: DTC 23 Throttle Position Sensor (TPS) connector
open or DTC 13 Engine speed, DTC 54 Mode switch
illegal position exists:
Table 1
TECH1 DISPLAY p
SELECTOR PIN A X
SELECTOR PIN B
SELECTOR PIN C
SELECTOR PIN P X
• Install scan tool GOTHROUGH TECH1 CONNECTION.
• Ignition switch ON. Engine running.
• Selector lever position "P". • Select FO: DATALIST: "TOP SIGNAL" or FO: DATA LIST: "AT INPUT SPEED".
IF: Display does not change with engine speed or TPS:
DTC 23 or DTC 13 not detected
but are the reason for this DTC 53.
GOTO DTC13 or DTC23.
R
X
X
The problem is
intermittent. GOTO
INTERMITTENT
CONDITIONS.
SHIFT
SELECTOR POSITION
N D
3
X
X X X
X
X
X X
2 L
X
X X
X
• Ignition switch ON.
• Select FO: DATALIST: "SELECTOR POS.".
• Move shift selector lever through all positions
and compare
results with table 1. IF: all selector pin displays correct:
• Check automatic transmission mode switch
adjustment. GOTHROUGH MODE SWITCH
SETTING PROCEDURE (~. ;"A•1~'Yl
• Repair.
Note:
"X" indicatesTECH1 displays "ACTIVE".

7A-134 AUTOMATIC TRANSMISSION (4L30-E)
DIAGNOSTIC TROUBLE CODE (DTC) 62
DOWNSHIFT PROTECTION
This DTC flashes the CHECK TRANS indicator and
sets the
BACKUP MODE.
Circuit Description:
• The output speed information is used to
determine if the transmission has to upshift or
downshift.
• If this information suddenly changes due to an
open circuit or some electrical interference the
transmission
would downshift.
• To avoid this the Transmission Control Module
(TCM) is constantly checking the variations of the
Output Speed. If this variation is too great (too
much decrease
or increase) DTC62 is set. This
variation is taken into
amount only when the
output speed is more than : 90 KPH.
• The transmission output speed sensor provides
information on vehicle speed to the TCM. The
speed sensor circuit consists
of a magnetic
induction
type sensor. The sensor is mounted
above a target wheel pressed on the output shaft
in the transmission extension. As the
output
shaft turns, the target wheel teeth induce a
TRANSMISSION SPEED SENSOR SHIELDS
variable voltage in the magnetic pickup. This
alternating current (AC) signal is provided to the
TCM. The
voltage increases with the speed of
the wheel but this is not used to define the speed
of the vehicle. As the vehicle moves faster, the
signal alternates faster between positive and
negative
voltages. The Output speed information
is proportiional to the frequency of the signal.
Diagnostic Aids:
• This Diagnostic is not an electrical test done by
the TCM but a test between different information
("logic test").
• Detection conditions:
G) Variation of Output Speed >16 KPH/0.025s.
@ Ignition ON more than 5 seconds.
@ Mode Switch not in P, N or R.
@ Last Output Speed > 90 KPH.
@ The conditions need to be present for at least
0.1 second.
• Action after the detection time: BACKUP MODE.
•
Recovery Gonditions: To recover, do an IGNITION
CYCLE.
- - - -C-90 / " I ,---:-"'\. '-. ~---+I WHT I I I I ~-10 I 'I I 'I M-1
5 r - - - - - - -TRANSMISSION ) f I SPEED SENSOR I . I f A 12 I I I I ~ I I I I
I II I I I I I I I I I
I II I I I I 1 I I
~~~~rie II I Ill I I
IINPUT II I I I I
1 1 1 I l I I I I -? ORN I I < I I
I l: ):~~ BLK \~ __ ~~ __ ~
I GROUNO I C-91 BLK/ORN H-11
I I I C1 BLK/BLU ~ 9_ I ____ I D1
TRANSMISSION
CONTROL MODULE (TCM)
2 I I (EXTENSION)
: : .·(C},h.·.. ,.·, .. ·.,· .. : HOUSING
II II ·<;',~ . I
I I . 'I ' . . I
I I I
) I> 1 ________ I
•