ABS ISUZU KB P190 2007 Workshop Repair Manual

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-29
Scan Tool Does Not Communicate with Keyword Device
Circuit Description
The TCM, electronic hydraulic control unit (EHCU)
[ABS module] and supplemental restraint system
(SRS) control module all communicate with the scan
tool over the Keyword serial data link.
Diagnostic Aids
The following conditions will cause a loss of Keyword
serial data communication between the scan tool and
the TCM.
• A Keyword serial data circuit open • A Keyword serial data circuit shorted to ground
• A Keyword serial data circuit shorted to voltage
• An internal condition within a module or connector on the Keyword serial data circuit, that causes a
short to voltage or ground to the Keyword serial
data circuit
Schematic Reference: Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or TCM Connector End
Views
Circuit/ System Testing Scan Tool Does Not Communicate with Keyward Device
Step Action Value(s)Yes No
1 Did you perform the Diagnostic System Check -
Engine Controls? —
Go to Step 2 Go to Diagnostic
System Check - Transmission Controls
2 1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Attempt to establish communication with the listed control modules.
•TCM
• Electronic hydraulic control unit (EHCU) [ABS module] (If so equipped)
• Supplemental restraint system (SRS) control module (If so equipped)
Does the scan tool communicate with any of the
listed control modules? —
Go to Step 3 Go to Step 7
3 Does the scan tool communicate with the TCM?
—Go to Step 4 Go to Lost
Communication with
The Transmission Control Module (TCM)
4 Notice:
If no ABS is installed, skip to Step 5.
Does the scan tool communicate with the EHCU? —
Go to Step 5 Go to Diagnostic
System Check - Anti-lock Brake Controls
5 Notice:
If no SRS is installed, skip to Step 6.
Does the scan tool communicate with the SRS
control module? —
Go to Step 6 Go to Diagnostic
System Check -SRS Controls
6 Test the Keyword serial data circuit for an
intermittently short to ground or intermittently short
to voltage. Then, test the Keyword serial data
circuit for an intermittently open (based on which
control module did not communicate) at the
connection in the circuit.
Did you find and correct the condition? —
Go to Step 15 System OK
7 1. Inspect for an intermittent, for a poor
connection and for corrosion at the data link
connector (DLC) (pin 7 of B-58).
2. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 15 Go to Step 8

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ISUZU KB P190 2007

7A2-30 TRANSMISSION CONTROL SYSTEM (JR405E)
81. Turn OFF the ignition.
2. Disconnect the TCM C-94 and C-95 harness connectors.
3. Turn ON the ignition, with the engine OFF.
4. Attempt to communicate with the EHCU and SRS control module.
Does the scan tool communicate with the EHCU
and SRS control module? —
Go to Step 12 Go to Step 9
9 Notice:
If no ABS is installed, skip to Step 10.
1. Turn OFF the ignition.
2. Reconnect the TCM harness connectors.
3. Disconnect the EHCU harness connector.
4. Turn ON the ignition, with the engine OFF.
5. Attempt to communicate with the TCM and SRS control module.
Does the scan tool communicate with the TCM and
SRS control module? —
Go to Step 13 Go to Step 10
10 Notice:
If no SRS is installed, skip to Step 11.
1. Turn OFF the ignition.
2. Reconnect the TCM harness connectors if disconnected.
3. Reconnect the EHCU harness connector if disconnected.
4. Disconnect the SRS control module harness connector.
5. Turn ON the ignition, with the engine OFF.
6. Attempt to communicate with the TCM and EHCU.
Does the scan tool communicate with the TCM and
EHCU? —
Go to Step 14 Go to Step 11
11 Repair the short to ground or short to voltage on
the Keyword serial data circuit between the DLC
and TCM, EHCU and SRS control module.
Did you complete the repair? —
Go to Step 15 —
12 Important:
Replacement TCM must be
programmed.
Replace the TCM. Refer to TCM Replacement.
Did you complete the replacement? —
Go to Step 15 —
13 Replace the EHCU. Refer to EHCU Replacement.
Did you complete the replacement? —
Go to Step 15 —
14 Replace the SRS control module. Refer to SRS
Control Module Replacement.
Did you complete the replacement? —
Go to Step 15 —
15 Attempt to establish communication with the TCM,
EHCU and SRS control module.
Does the scan tool communicate with the TCM,
EHCU and SRS control module? —
System OK Go to Step 2
Step
Action Value(s)Yes No

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ISUZU KB P190 2007

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-31
Lost Communication with The Transmission Control Module (TCM)
Circuit Description
The TCM, electronic hydraulic control unit (EHCU)
[ABS module] and supplemental restraint system
(SRS) control module all communicate with the scan
tool over the Keyword serial data link. Schematic Reference:
Transmission Controls
Schematics
Connector End View Reference: Transmission
Controls Connector End Views or TCM Connector End
Views
Circuit/ System Testing Lost Communication with The Transmission Control Module (TCM)
Step Action ActionYes No
1 Did you perform the Diagnostic System Check -
Engine Controls? —
Go to Step 2 Go to Diagnostic
System Check - Transmission
Controls
2 Attempt to establish communication with the TCM.
Does the scan tool communicate with the TCM? —
Go to Intermittent
Conditions Go to Step 3
3 1. Inspect for an intermittent, for poor
connections and for corrosion at the TCM C-
94 and C-95 harness connectors.
2. Repair the connection(s) as necessary.
Did you find and correct the condition? —
Go to Step 9 Go to Step 4
4 1. Check the TCM (15A) in the cabin fuse block.
Replace and retest if open. If any fuse
continues to open, repair the short to ground
on each circuit fed by that fuse.
2. Turn OFF the ignition.
3. Disconnect the TCM C-95 harness connector.
4. Turn ON the ignition, with the engine OFF.
5. Connect a test lamp to ground and check for voltage at the ignition voltage supply circuit at
the TCM (pins 18 and 24 of C-95).
Does the test lamp illuminate? —
Go to Step 6 Go to Step 5
5 Repair the open in the ignition voltage circuit to the
TCM.
Did you complete the repair? —
Go to Step 9 —
6 1. Turn OFF the ignition.
2. Disconnect the TCM C-94 harness connector.
3. Inspect for an intermittent, for poor connections and corrosion at the harness
connector of the TCM (pin 5 of C-94).
4. Test the Keyword serial data circuit between the TCM (pin 5 of C-94) and the DLC (pin 7 of
B-58) for an open circuit or high resistance.
5. Repair the connection(s) or circuit(s) as necessary.
Did you find and correct the condition? —
Go to Step 9 Go to Step 7
7 1. Check TCM ground for corrosion and
tightness.
2. Clean or tighten grounds as necessary.
Did you find and correct the condition? —
Go to Step 9 Go to Step 8

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ISUZU KB P190 2007

ON-VEHICLE SERVICE (JR405E) 7A3-5
TRANSMISSION CONTROL MODULE (TCM)



RTW 37ALF001901

Remove and Disconnect
1. Disconnect the negative battery cable.
2. Remove the connectors.
3. Remove the fixing nuts and remove the TCM (1) from the bracket.
Note:
The TCM is fitted under the instrument panel of the
driver’s compartment via three stud bolts.


Install or Connect
Follow the removal steps in the reverse order. Be
absolutely sure that the connectors are securely
fastened.




RTW 77ASH000801



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ISUZU KB P190 2007

TRANSFER CASE 7D-39
43. Use an installer (5-8840-2787-0) to install the main
shaft end snap ring to the rear output shaft (from the
back end of the shaft). Be absolutely sure that the
snap ring is seated in the groove.

226R300022

44. Use an installer (5-8840-2786-0) to install the rear
output oil seal to the rear case.


RTW 77DSH000401


220R300021
45.
Install the detent balls, the detent springs, and the
detent plugs (2 parts each) to the transfer case.
Tighten the plugs to the specified torque.
Detent plug torque: 19 N ·m (1.9 kgf ·m/14 lb ·ft)
46. Install the neutral switch (black harness cover) to the
transfer case and tighten the bolts to the specified
torque.
Neutral switch bolt torque:
39 N ·m (4.0 kgf ·m/29 lb ·ft)
47. Install the 2-4 switch (gray harness cover) to the
transfer case and tighten the bolts to the specified
torque.
2-4 switch bolt torque: 39 N ·m (4.0 kgf ·m/29 lb ·ft)
48. Install the switch bracket to the transfer case and
tighten the bolts to the specified torque.
Switch bracket bolt torque:
15 N ·m (1.5 kgf ·m/11 lb ·ft)
49. Install the transfer actuator assembly to the transfe
r
case and tighten the bolts to the specified torque. The
actuator must be installed in the same direction as the
shaft.
Transfer actuator assembly bolt torque:
22 N ·m (2.2 kgf ·m/16 lb ·ft)
50. Install the breather hose between the transfe
r
actuator and the transfer case.
51. Install the speedometer driven gear, the speedomete
r
bushing, and the speedometer stay to the transfe
r
case. Tighten the bolts to the specified torque. (M/T:
MUA, MUX, A/T: JR405E, AW 30-40LE)
Speedometer bolt torque:
15 N ·m (1.5 kgf ·m/11 lb ·ft)

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ISUZU KB P190 2007

TRANSFER CONTROL SYSTEM 7D1-47
3. Shifting from 4H to 4L
3-1 When the 4L indicator flashes at 2Hz
W hen shifting from 4H to 4L, the 4L indicator continues flashing at 2Hz until shifting in the transfer case is
completed. The phases of the engaged splines may sometimes deviate preventing completion of shifting. By
correcting the deviation of phases, shifting is completed.

Step 3-1:
(In case of AT): Set the select bar of the transmission to the D position.
(In case of MT): Set the lever of the transmission to a position allowing running and engage the clutch gently.
At this time, some rotating force acts on the engaged splines, phase is corrected and the engagement is
completed.
3-2 When the 4L indicator flashes at 2Hz for 10 seconds and then keeps ON again (AT vehicle)
This condition occurs when torsional torque has been generated between the transmission and road surface
and the transfer standby mechanism cannot absorb it completely.

Step 3-2:
Set the select lever of the transmission to the N position. (Stepping on the brake pedal is effective at
this time.)
3-3 When the 4L indicator flashes at a frequency of 4Hz
Shifting from 4H to 4L is restricted.
W hen the vehicle is running, the transmission lever is at the running range and the engine speed is high (L4:
3000rpm or more V6: 2000rpm), the transfer cannot be shifted from 4H to 4L (restriction on operation).
Restriction on operation (Except 4JA1-T)
The 4H, neutral and 4L shifting mechanism has no synchronization function. Therefore, if relative rotations in the
mechanism become excessive, shifting exerts adverse influence on the internal mechanism of the transfer. To
avoid such a trouble, vehicle condition is detected to restrict the operation (vehicle speed, engine speed and TM
position).
Requirement to restrict the speed: Vehicle should be in stop. Due to the detection logic, time to wait for start of operation may be required.
A/T: If the vehicle is in stop for a long time at the TM running range (D, 1, 2) before operating the AT, waiting
time becomes longer (from 1 second to 3 minutes at the maximum).
M/T: If the vehicle is at stop with the clutch stepped on at the T/M running position (1 – R), the time to wait
becomes longer.
W aiting time means the time commencing from when other requirements (engine speed and T/M position) are
met to permission of the speed restriction. Operation during the waiting time is not permissible.
The waiting time is 1 second at the minimum and increases up to 5 seconds if the above condition continues for
3 minutes. After that, the waiting time increases up to 3 minutes in 2 minute intervals.
W hen it is clear that the above condition has continued and reduction of waiting time is required, turn on or off
the ignition or start and stop the vehicle several meters.
Requirements for permission of restriction on engine speed: Engine speed should be decreased.
The engine speed of 3000rpm (V6: 2000rpm) or below is advisable.
Requirements for permission of restriction on T/M position restriction:
(AT) N range is recommended
(MT) should be at the neutral.

These requirements for permission should all be met before the switch is operated. If the requirements are met
after operation, operation is not automatically effected but re-operation is required after permission is given.

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8A-12 ELECTRICAL-BODY AND CHASSIS
ABBREVIATIONS
Abbreviation Meaning of abbreviation Abbreviation Meaning of abbreviation
A Ampere (S) kW Kilowatt
ABS Anti-lock brake system LH Left hand
ASM Assembly LW B Long wheel base
AC Alternating current MPI Multipart fuel injection
A/C Air conditioner M/T Manual transmission
ACC Accessories PA Passenger
CARB Carburetor PIM Power train interface module
C/B Circuit breaker PJT Projector
CKP Crankshaft position QOS Quick On Start system
CSD Cold start device RH Right hand
DIS Direct ignition system RR Rear
DR Driver RW AL Rear wheel anti-lock brake system
DRM Data Recording Module SCV Suction control valve
EHCU Electronic Hydraulic control Unit SRS Supplemental restraint system
ECGI Electronic control gasoline injection ST Start
ECM Engine control module STD Standard
ECU Electronic control unit SW Switch
EFE Early fuel evaporation SW B Short wheel base
EGR Exhaust gas recirculation TCM Transmission control module
2W D Two-wheel drive TCCM Transfer case control module
4W D Four-wheel drive V Volt
FL Fusible link VSV Vacuum switching valve
FRT Front W W att (S)
H/L Headlight W OT W ide open throttle
W/ With HVAC
Heater, Ventilation, and Air
Conditioning W /O W ithout
IC Integrated circuit W /S W eld Splice
IG Ignition


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ELECTRICAL-BODY AND CHASSIS 8A-21
Caution:
Do not attach the booster cable to the discharged battery
negative terminal.

11. Start the engine of the vehicle with the booster battery.
Check that all unnecessary electrical accessories are off.
12. Start the engine of the vehicle with the discharged battery.
13. Remove the jumper cables in the reverse order to which they were attached.
Caution:
Be absolutely sure to remove the negative jumper cable
from the vehicle with the discharged battery first.


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ELECTRICAL-BODY AND CHASSIS 8A-25
Light Name Bulb No. Rated Power
V-W Number
of Bulbs Lens
Color Remarks
P16W 12-21 2 W hite Regular cab Backup light
P21W 12-16 2 W hite Extend cab, Crew cab
License plate light W 5W 12-5 2 W hite
A/C-Heater control light - 12-0.7 1 -
Dome light - 12-10 1 W hite
Spotlight/ Map light - 12-5 2 W hite

Light Name Rated Power
V-W Luminous Color Remarks
ILLUMINATION
LIGHT LED W hite
MULTI FUNCTION DISPLAY LCD Light blue
TURN SIGNAL LED Green
HIGH BEAM LED Blue
LOW FUEL LED Amber
A/T OIL TEMP LED Red
BRAKE LED Red
4W D LED Green
SEAT BELT LED Red
CHECK ENGINE LED Amber
OIL LED Red
FUEL FILTER LED Green
ABS LED Amber
SEDIMENTER LED Red
SRS LED Red
CHARGE LED Red
CHECK TRANS LED Red
CHECK 4W D LED Red
POW ER DRIVE LED Amber
3RD START LED Green
4W D-LOW LED Green
DOOR AJAR LED Red
P LED/LCD Green
R LED/LCD Green
N LED/LCD Green
D LED/LCD Green
3 LED/LCD Green
2 LED/LCD Green
A/T shift
indicator
L LED/LCD Green LED: Indicated on
the gauge
panel
LCD: Indicated on the
tachometer
panel
Meter
Illumination
light,
Indicator
light,
W arning
light

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ELECTRICAL-BODY AND CHASSIS 8A-31
FUSE AND SLOW BLOW FUSE LOCATION
RELAY & FUSE BOX (ENGINE ROOM)
RHD


FUSE ∗1 AUSTRALIA
ENGINE MODEL
FUSE NO. C24SE
HFV6 4JA1T (L) 4JJ1-TC/ 4JK1-TC
EB1 15A ECM
← 10A ACG (S)
←
EB2
 15A 02 SENS PRE
 10A ECM (B)
EB3 15A FRT FOG 10A ECM (B)
 10A F/PUMP

20A TRAILER ∗1
EB4 10A ACG (S)
10A TCM PIM B
 10A ENGINE
EB5 10A ILLUMI
10A H/L (RH) HI
← ←

10A H/L (RH) HI ∗1
EB6 10A H/L (LH) HI
← ← ←
EB7 10A H/L (RH) LOW
← ← ←
EB8 10A H/L (LH) LOW
← ← ←
EB9 20A F/PUMP 20A TRAILER
 20A TRAIKER
EB10 10A SENSOR   20A COND, FAN
EB11 10A TAIL (RH)
← ← ←
EB12 10A ILLUMI & TAIL-LH
← ← ←
EB13 10A A/C
← ← ←
EB14 10A 4W D
← ← ←
EB15 10A HORN
← ← ←
EB16 10A HAZARD
← ← ←

SLOW BLOW FUSE
ENGINE MODEL
FUSE NO. C24SE
HFV6 4JA1T (L) 4JJ1-TC / 4JK1-TC
SBF1 100A MAIN ←

80A MAIN 120A MAIN
SBF2

20A FRT FOG
40A ABS1 ←

SBF3 
60A RAD. FAN
20A ABS2 ←

SBF4 20A COND, FAN 20A F/PUMP
20A COND, FAN 40A ECM
SBF5 40A IG 1
←
← ←
SBF6 

30A BLOW ER ←
←
SBF7 20A FRT FOG
40A ABS1 20A FRT FOG ←

SBF8 30A BLOW ER
20A ABS2 50A GLOW 60A GLOW
SBF9
50A IG 2
60A IG 2 50A IG 2 60A IG 2



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