Isuzu Trooper (1998-2002 year). Service manual — part 631
6E–172
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1657 (Flash DTC 76)
ECM Main Relay Circuit Open/Short
060RW135
Circuit Description
The ECM main relay circuit receives current through ECM
50A fuse from the battery, current flowing in the order of
the ECM main relay and ECM.
Action Taken When the DTC Sets
D
The ECM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
D
The ECM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
D
DTC P1657 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the ECM battery
feed.
Diagnostic Aids
Check for the following conditions:
D
Poor connection at ECM – Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.
D
Damaged harness – Inspect the wiring harness for
damage.
6E–173
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1657 – ECM Main Relay Circuit Open/Short
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Check the Fuse 50A·ECM and 15A·Eng.
2. If the Fuse is open, replace it as necessary.
Was the Fuse open?
—
Verify repair
Go to
Step 3
3
1. Ignition “ON,” engine “OFF.”
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using a Tech 2, monitor the “DTC” info for DTC
P1657.
Does the Tech 2 indicate DTC P1657 failed?
—
Go to
Step 4
Refer to
Diagnostic
Aids
4
Check the ECM Main Relay circuit between the Fuse
and the ECM Main Relay for a poor connection and
repair the terminal if necessary.
Did the terminal require repair?
—
Verify repair
Go to
Step 5
5
Check the ECM Main Relay for a damage and Replace
the ECM (Refer to the Data Programming in Case of
ECM change) Main Relay if necessary.
Did the ECM Main Relay require replacement?
—
Verify repair
Go to
Step 6
6
Check the ECM Main Relay circuit for a poor
connection at the ECM and replace the terminal if
necessary.
Did the terminal require replacement?
—
Verify repair
Go to
Step 7
7
Check the ECM Main Relay Ground circuit for a poor
connection and repair the terminal if necessary.
Did the terminal require repair?
—
Verify repair
Go to
Step 8
8
Check the ECM Main Relay power circuit for a poor
connection and repair the terminal if necessary.
Did the terminal require repair?
—
Verify repair
Go to
Step 9
9
Replace the ECM (Refer to the Data Programming in
Case of ECM change) Main Relay.
Is the action complete?
—
Verify repair
Go to
Step 10
10
Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
—
Verify repair
—
6E–174
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1589 (Flash DTC 47)
Transmission SW Circuit Open/Short
060RW131
Circuit Description
The trans mission SW circuit receives current through
ELEC IG 10A fuse from the battery, current flowing in the
order of the trans mission SW and ECM.
Action Taken When the DTC Sets
D
The ECM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
D
The ECM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
D
DTC P1589 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the ECM battery
feed.
Diagnostic Aids
Check for the following conditions:
D
Poor connection at ECM – Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.
D
Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
throttle position display on the Tech 2 while moving
connectors and wiring harnesses related to the TP
sensor. A change in the display will indicate the
location of the fault.
If DTC P1589 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage since the DTC was last set.
DTC P1589 – Transmission Circuit Open/Short
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
Check the Fuse 10A for a open circuit and replace the
Fuse if necessary.
Did the Fuse require replacement?
—
Verify repair
Go to
Step 3
6E–175
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC P1589 – Transmission Circuit Open/Short
(Cont'd)
Step
No
Yes
Value(s)
Action
3
1. Ignition “ON,” engine “OFF.”
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using a Tech 2, monitor the “DTC” info for DTC
P1589.
Does the Tech 2 indicate DTC P1589 failed?
—
Go to
Step 4
(A/T)
Go to
Step 6
(M/T)
Refer to
Diagnostic
Aids
4
Check the Indicator Lamp correct indicated for a
correct indication on the Meter. (A/T only)
Did the Indicator Lamp correct indicated?
—
Go to
Step 5
Go to
Step 8
5
Check the Trans Mission SW signal circuit for a poor
connection at the ECM and replace the terminal if
necessary.
Did the terminal require replacement?
—
Verify repair
Go to
Step 8
6
Check the Trans Mission SW circuit for a poor
connection at the Trans Mission SW and replace the
terminal if necessary.
Did the terminal require replacement?
—
Verify repair
Go to
Step 7
7
Replace the Trans Mission SW.
Is the action complete?
—
Verify repair
Go to
Step 8
8
Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
—
Verify repair
—
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