Chrysler Town, Dodge Caravan. Manual - part 1160

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the ignition switch harness connector.
Measure the resistance between ground and the Fused Ignition Switch Output
(RUN/START) circuit.
Is the resistance above 1000 ohms?

All

Yes

→ Go To 4

→ Repair the Fused Ignition Switch Output (RUN/START) circuit

for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.

If there are no possible causes remaining, view repair.

All

Repair

Using the schematic, ensure no shared circuits on the Fused
Ignition Switch Output (RUN/START) ckt are causing an initial
low spike in circuit voltage. If all other components are OK,
replace and program the ECM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.

WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?

All

Yes

→ Repair as necessary.

Perform ROAD TEST VERIFICATION - VER-2.

→ Test Complete.

183

DRIVEABILITY - DIESEL

P1605-IGNITION SWITCH PLAUSIBILITY —

Continued

Symptom List:

P1651-MIL/DIAG LAMP VIA J1850 BUS IN FRAME RESPONSE ER-
ROR
P1651-MIL/DIAG LAMP VIA J1850 BUS STATUS ERROR

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be P1651-MIL/DIAG LAMP VIA
J1850 BUS IN FRAME RESPONSE ERROR.

When Monitored and Set Condition:

P1651-MIL/DIAG LAMP VIA J1850 BUS IN FRAME RESPONSE ERROR

When Monitored:

With the ignition on.

Set Condition:

The ECM receives an incorrect response from the instrument cluster

when a J1850 message to actuate the MIL is transmitted.

P1651-MIL/DIAG LAMP VIA J1850 BUS STATUS ERROR

When Monitored:

With the ignition on.

Set Condition:

The ECM has not received any J1850 messages from the instrument

cluster.

POSSIBLE CAUSES

ENGINE CONTROL MODULE

REFER TO COMMUNICATION SECTION

INTERMITTENT CONDITION

TEST

ACTION

APPLICABILITY

NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRBIII

t, erase the ECM DTCs.

Cycle the ignition switch from OFF to ON.
Monitor the DRBIII

t for ECM DTCs.

Does the DRBIII

t display this DTC?

All

Yes

→ Go To 2

→ Go To 3

184

DRIVEABILITY - DIESEL

TEST

ACTION

APPLICABILITY

Start and idle the engine.
With the DRBIII

t, select Instrument Cluster and read the PCM/ECM Monitors.

NOTE: If the DRB is unable to communicate with the Instrument cluster,
refer to the appropriate symptom in the Body Diagnostic Information
Does the DRB display accurate monitors?

All

Yes

→ Replace and program the Engine Control Module in accordance

with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.

→ Refer to Body Diagnostic Information for problems related to

Communication with ECM.
Perform ROAD TEST VERIFICATION - VER-2.

All

Yes

→ Repair as necessary.

Perform ROAD TEST VERIFICATION - VER-2.

→ Test Complete.

185

DRIVEABILITY - DIESEL

P1651-MIL/DIAG LAMP VIA J1850 BUS IN FRAME RESPONSE ERROR —

Continued

Symptom List:

P1652-J1850 COMMUNICATION BUS RECEIVE TIMEOUT
P1652-J1850 COMMUNICATION BUS SHORT TO GROUND
P1652-J1850 COMMUNICATION BUS SHORT TO VOLTAGE
P1652-J1850 COMMUNICATION BUS SPI ERROR
P1652-J1850 COMMUNICATION BUS TRANSMIT BUFFER OVER-
RUN
P1652-J1850 COMMUNICATION BUS UNAUTHORIZED RESET

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be P1652-J1850 COMMUNICATION
BUS RECEIVE TIMEOUT.

When Monitored and Set Condition:

P1652-J1850 COMMUNICATION BUS SHORT TO GROUND

When Monitored:

With the ignition on.

Set Condition:

The ECM detects continuous low voltage on the J1850 Bus circuit.

P1652-J1850 COMMUNICATION BUS SHORT TO VOLTAGE

When Monitored:

With the ignition on.

Set Condition:

The ECM detects continuous high voltage on the J1850 Bus circuit.

P1652-J1850 COMMUNICATION BUS UNAUTHORIZED RESET

When Monitored:

With the ignition on.

Set Condition:

An unauthorized reset of the J1850 hardware occurs during normal

operation.

POSSIBLE CAUSES

ENGINE CONTROL MODULE

VERIFY INSTRUMENT CLUSTER COMMUNICATION

INTERMITTENT CONDITION

186

DRIVEABILITY - DIESEL

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