Dodge Dakota (R1). Manual — part 862
Symptom:
P1491-RAD FAN CONTROL RELAY CIRCUIT
POSSIBLE CAUSES
RADIATOR FAN CONTROL RELAY CIRCUIT WIRE HARNESS INTERMITTENT PROBLEM
RADIATOR FAN CONTROL RELAY CIRCUIT WIRE HARNESS OBSERVABLE PROBLEM
RADIATOR FAN RELAY GROUND CIRCUIT OPEN
RAD FAN RELAY CONTROL CIRCUIT OPEN
RADIATOR FAN RELAY CONTROL CIRCUIT SHORT TO GROUND
RADIATOR FAN CONTROL RELAY
PCM
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, actuate the Radiator Fan Relay.
Does the Radiator Fan Motor Cycle on and off?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRBIII
t, actuate the Radiator Fan Relay.
Wiggle the wiring harness from the Radiator Fan Relay connector to the PCM
harness connector.
Did the wiggling interrupt the Radiator Fan Motor cycling?
All
Yes
→
Repair as necessary where wiggling caused the cycling to be
interrupted.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
3
Turn the ignition off.
Using the schematic as a guide, inspect the wiring and connectors.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
Test Complete.
4
Turn the ignition off.
Remove the Radiator Fan Relay form the PDC.
Measure the Radiator Fan Relay Ground Circuit to Ground.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open Ground Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
180
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect the PCM harness connector(s).
Remove the Radiator Fan Relay for the PDC.
Measure the resistance of the Radiator Fan Relay Control circuit form PDC to PCM
harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open Radiator Fan Relay Control Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
6
Turn the ignition off.
Remove the Radiator Fan Relay from the PDC.
Disconnect the PCM harness connector(s).
Measure the resistance between ground and the Radiator Fan Relay Control circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Radiator Fan Relay Control Circuit for a short to
ground.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
7
Turn the ignition off.
Disconnect the PCM harness connector(s).
Connect a jumper wire to the Radiator Fan Relay Control circuit in the PCM harness
connector.
Momentarily connect the other end of the jumper wire to ground.
Did the Radiator Fan actuate?
All
Yes
→
No
→
Replace the Radiator Fan Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
8
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
181
DRIVEABILITY - GAS
P1491-RAD FAN CONTROL RELAY CIRCUIT —
Continued
Symptom:
P1494-LEAK DETECTION PUMP SW OR MECHANICAL FAULT
When Monitored and Set Condition:
P1494-LEAK DETECTION PUMP SW OR MECHANICAL FAULT
When Monitored:
Immediately after a cold start, with battery/ambient temperature
between 40 deg. F and 90 deg. F and coolant temperature within 10 deg. F of battery/
ambient.
Set Condition:
The state of the switch does not change when the solenoid is energized.
POSSIBLE CAUSES
WIRING HARNESS INTERMITTENT
LDP SWITCH SENSE CIRCUIT SHORTED TO GROUND
LDP VACUUM SUPPLY
LEAK DETECTION PUMP
LDP SWITCH SENSE CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Is the DTC Good Trip Counter displayed and equal to zero for P-1494?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the vacuum supply hose at the Leak Detection Pump.
Connect a vacuum gauge to the disconnected vacuum supply hose at the Leak
Detection Pump.
Start the engine and read the vacuum gauge.
Does the vacuum gauge read at least 13 in/Hg?
All
Yes
→
No
→
Repair leak or obstruction in vacuum hose as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
182
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Leak Detection Pump harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the LDP Switch Sense Circuit from the PCM harness
connector to LDP harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open Leak Detection Pump Switch Sense Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
4
Turn the ignition off.
Disconnect the Leak Detection Pump electrical harness connector.
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the 9Leak Detect Pump Sw9 state.
While observing the
9Leak Detect Pump Sw9 state, connect a jumper wire between a
good 12 volt source (B+) and the LDP Switch Sense circuit.
Did the
9Leak Detect Pump Sw9 state change when the jumper was connected?
All
Yes
→
Replace the Leak Detection Pump.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
No
→
5
Turn the ignition off.
Disconnect the Leak Detection Pump electrical harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance between the LDP Switch Sense circuit and ground.
Is the resistance below 5.0 Ohms?
All
Yes
→
Repair the LDP Switch Sense Circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
No
→
6
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
7
At this time, the conditions required to set the DTC are not present.
Note: Use the Freeze Frame Data to help you duplicate the conditions that
set the DTC. Pay particular attention to the DTC set conditions, such as,
VSS, MAP, ECT, and Load.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB’s) that may apply.
Perform a wiggle test of the LDP wiring while the circuit is actuated with the
DRBIII
t. Listen for the LDP to quit actuating. Also watch for the Good Trip Counter
to change to 0.
Were any problems found?
All
Yes
→
Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 6.
No
→
Test Complete.
183
DRIVEABILITY - GAS
P1494-LEAK DETECTION PUMP SW OR MECHANICAL FAULT —
Continued
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