Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Service manual — part 75
4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS
6E–295
7
Using the DVM and check the “CHECK ENGINE”
lamp circuit.
Breaker box is available:
1. Ignition “Off”, engine “Off”.
2. Install the breaker box as type A. (ECM
disconnected) Ref. Page 6E-81
3. Disconnect the immobiliser control unit connector.
4. Check the circuit for open or short to ground
circuit.
Was the problem found?
Breaker box is not available:
1. Ignition “Off”, engine “Off”.
2. Disconnect the the immobiliser control unit
connector and ECM connector.
3. Check the circuit for open or short to ground
circuit.
Was the problem found?
—
Repair faulty
harness and
verify repair
Go to Step 8
Step
Action
Value(s)
Yes
No
42
7
B-68
42
7
C-56
B-68
6E–296
4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS
8
Using the DVM and check the ECM and immobiliser
control unit communication circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the immobiliser control unit connector.
3. Ignition “On”.
4. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
Less than 1V
Go to Step 9
Repair faulty
harness and
verify repair
9
Using the DVM and check the ECM and immobiliser
control unit communication circuit.
Breaker box is available:
1. Ignition “Off”, engine “Off”.
2. Install the breaker box as type A. (ECM
disconnected) Ref. Page 6E-81
3. Disconnect the immobiliser control unit connector.
4. Check the circuit for open or short to ground
circuit.
Was the problem found?
Breaker box is not available:
1. Ignition “Off”, engine “Off”.
2. Disconnect the the immobiliser control unit
connector and ECM connector.
3. Check the circuit for open or short to ground
circuit.
Was the problem found?
—
Repair faulty
harness and
verify repair
Go to Step 10
Step
Action
Value(s)
Yes
No
8
V
B-68
35
8
B-68
35
8
C-56
B-68
4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS
6E–297
10
Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?
—
Verify repair
Go to Step 11
11
Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobiliser system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobiliser System-ECM replacement” for
the ECM/Immobiliser linking procedure.
—
Verify repair
—
Step
Action
Value(s)
Yes
No
6E–298
4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS
DIAGNOSTIC TROUBLE CODE (DTC) P1613 (SYMPTOM CODE A)
(FLASH CODE 56) IMMOBILISER NO OR WRONG SIGNAL
Condition for setting the DTC and action taken when the DTC sets
Circuit Description
The ECM decides whether that is an abnormality in the
immobiliser control system. DTC P1613 (Symptom
Code A) is recorded when received immobiliser
response signal was not correct.
Diagnostic Aids
Check for the following conditions:
• Poor connection at ECM and immobiliser control unit-
Inspect harness connectors for backed out terminals,
improper mating, broken locks, improperly formed or
damaged terminals, and poor terminal to wire
connection.
• Damaged harness-Inspect the wiring harness for
damage. If the harness appears to be OK, observe
the DTC P1613 display on the Tech2 while moving
connectors and wiring harnesses.
Flash
Code
Code
Symptom
Code
MIL
DTC Name
DTC Setting Condition
Fail-Safe (Back Up)
56
P1613
A
-
Immobiliser No or Wrong Sig-
nal
Received response signal is
not correct or not received.
1. Engine does not start.
2. Check engine lamp flash.
Ignition
SW
Meter
15A
6 15
7
Batt
Batt
0.5
RED/
WHT
29
0.5
ORG/
BLU
43
0.5
BRN/
YEL
42
0.5
BLK/
RED
27
0.5
BLU/
WHT
0.5 BLU/BLK
68
0.5
WHT
2.0
BLK
35
VSS
0.85
YEL
Imnobiliser
Control Unit
7
8
0.5
BRN/
YEL
IC
0.85
YEL
Glow
Check
Engine
Tacho
Meter
Speed
Meter
A/T
TCM
µP
µP
µP
µP
Engine
Control
Module
(ECM)
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