Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Service manual — part 211
ENGINE DRIVEABILITY AND EMISSIONS
6E–85
13
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–86
ENGINE DRIVEABILITY AND EMISSIONS
NO CHECK ENGINE LAMP (MIL)
Circuit Description
The check engine lamp should be illuminated and
steady for about five seconds with the ignition “ON” and
the engine stopped. Ignition feed voltage is supplied to
the check engine lamp bulb through the meter fuse.
The Engine Control Module (ECM) turns the check
engine lamp “ON” by grounding the check engine lamp
driver circuit.
Diagnostic Aids
An intermittent check engine lamp may be cased by a
poor connection, rubbed-through wire insulation, or a
wire broken inside the insulation. Check for the
following items:
• Inspect the ECM harness and connections for
improper mating, broken locks, improperly formed or
damaged terminals, poor terminal-to-wire
connection, and damaged harness.
• If the engine runs OK, check for a faulty light bulb, an
open in the check engine lamp driver circuit, or an
open in the instrument cluster ignition feed.
• If the engine cranks but will not run, check for an
open ECM ignition or battery feed, or a poor ECM to
engine ground.
No Check Engine Lamp (MIL)
Buttery
Voltage
0.5
RED/
YEL
Engine
Room-RH
µP
J2-32
7
0.5
BRN/
YEL
Engine
Control
Module
(ECM)
Check
Engine
Lamp
Imnobiliser
Control
Unit
METER
15A
Ignition
SW
0.5
BLU
J2-4
0.5
GRN
J2-30
Diag
SW
Class 2
Serial
Data
0.85 BLK
Diagnostic
Comectar
16 15 14 13 12 11 10 9
8 7 6 5 4 3 2 1
METER
10A
Step
Action
Value(s)
Yes
No
1
Check the “Meter” fuse (15A).
If the fuse is burnt out, repair as necessary.
Was the problem found?
—
Verify repair
Go to Step 2
ENGINE DRIVEABILITY AND EMISSIONS
6E–87
2
Using the DVM and check the “CHECK ENGINE”
lamp circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the ECM connector.
3. Ignition “On”.
4. Check the circuit for open circuit.
Was the DVM indicated specified value?
Battery
voltage
Go to Step 5
Go to Step 3
3
Check the “CHECK ENGINE” lamp bulb.
If the bulb is burnt out, repair as necessary.
Was the problem found?
—
Verify repair
Go to Step 4
4
Using the DVM and check the “CHECK ENGINE”
lamp circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the meter connector and ECM
connector.
3. Check the circuit for open circuit.
Was the problem found?
—
Verify repair
Go to Step 5
5
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 6
6
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
V
32
C56(J2)
32
17
C56(J2)
B24
6E–88
ENGINE DRIVEABILITY AND EMISSIONS
CHECK ENGINE LAMP (MIL) “ON” STEADY
Circuit description
The check engine lamp should always be illuminated
and steady for about five seconds with ignition “ON” and
the engine stopped. Ignition feed voltage is supplied
directly to the check engine lamp indicator. The Engine
Control Module (ECM) turns the check engine lamp
“ON” by grounding the check engine lamp driver circuit.
The check engine lamp should not remain “ON” with the
engine running and no DTC(s) set. A steady check
engine lamp with the engine running and no DTC(s)
suggests a short to ground in the check engine lamp
driver circuit.
Diagnostic Aids
An intermittent may be caused by a poor connection,
rubbed-through wire insulation, or a wire broken inside
the insulation. Check for the following items:
• Poor connection or damaged harness - Inspect the
ECM harness and connectors for improper mating,
broken locks, improperly formed or damaged
terminals, poor terminal-to-wire connection, and
damaged harness.
Check Engine Lamp (MIL) “ON” Steady
Buttery
Voltage
0.5
RED/
YEL
Engine
Room-RH
µP
J2-32
7
0.5
BRN/
YEL
Engine
Control
Module
(ECM)
Check
Engine
Lamp
Imnobiliser
Control
Unit
METER
15A
Ignition
SW
0.5
BLU
J2-4
0.5
GRN
J2-30
Diag
SW
Class 2
Serial
Data
0.85 BLK
Diagnostic
Comectar
16 15 14 13 12 11 10 9
8 7 6 5 4 3 2 1
METER
10A
Step
Action
Value(s)
Yes
No
1
1. Ignition “Off”, engine “Off”.
2. Disconnect the ECM connector.
3. Ignition “On”.
Was the “CHECK ENGINE” lamp turned on?
—
Go to Step 2
Go to Step 4
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