2000 CHRYSLER VOYAGER Diagnostic Manual

Symptom:
P-1491 RADIATOR FAN CONTROL RELAY CIRCUIT
When Monitored and Set Condition:
P-1491 RADIATOR FAN CONTROL RELAY CIRCUIT
When Monitored: With the ignition key on, battery voltage greater than 10 volts, and the
PCM requests the fans to be turned on.
Set Condition: An open or shorted condition is detected in the radiator fan relay control
circuit.
POSSIBLE CAUSES
FUSED B (+) CIRCUIT OPEN
RAD FAN RELAY OUTPUT CIRCUIT, 0 VOLTS TO BATTERY V
RADIATOR FAN RELAY GROUND CIRCUIT OPEN
RADIATOR FAN RELAY DEFECTIVE
RAD FAN RELAY CONTROL CIRCUIT SHORT TO GROUND
RADIATOR FAN MOTORS W/H INTERMITTENT DEFECT
RADIATOR FAN MOTORS W/H OBSERVABLE DEFECT
RADIATOR FAN RELAY CONTROL CIRCUIT OPEN
PCM DEFECTIVE (RADIATOR FAN MOTORS)
TEST ACTION APPLICABILITY
1 Ignition On
With the DRB, actuate the Radiator Fan Relay.
Are both of the Radiator Fan Motors cycling on and off?All
Ye s®Go To 2
No®Go To 4
2 Ignition On
With the DRB, actuate the Radiator Fan Relay.
Wiggle the Wiring Harness from the Relay to the PCM.
Did the wiggling interrupt the Radiator Fan Motor cycling?All
Ye s®Repair as necessary where wiggling caused the cycling to be
interrupted.
Perform Powertrain Verification Test VER-5A.
No®Go To 3
3 Ignition Off
Using the schematic as a guide, inspect the Wiring and Connectors.
Were any problems found?All
Ye s®Repair as necessary.
Perform Powertrain Verification Test VER-5A.
No®Test Complete.
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TEST ACTION APPLICABILITY
4 Ignition On
With the DRB, actuate the Radiator Fan Relay.
Using a voltmeter, the Fan Relay Output Circuit voltage at the Relay Connector.
Does the voltage cycle from below 1.0 volt to Battery voltage?All
Ye s®Repair or replace Radiator Fans or Relay to Fan Wiring as
necessary.
Perform Powertrain Verification Test VER-5A.
No®Go To 5
5 Ignition Off
Disconnect the Radiator Fan Relay Connector.
Note: Check connectors - Clean/repair as necessary.
Turn key on.
Using a Voltmeter, measure the Fused B(+) Circuit at Relay Connector.
Is the voltage above 10.0 volts?All
Ye s®Go To 6
No®Repair the open Fused B (+) Circuit (check Radiator Fan Fuse in
PDC).
Perform Powertrain Verification Test VER-5A.
6 Ignition Off
Disconnect the Radiator Fan Relay Connector.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the Radiator Fan Relay Ground Circuit.
Is the resistance below 5.0 ohms?All
Ye s®Go To 7
No®Repair the open Fan Relay Ground Circuit.
Perform Powertrain Verification Test VER-5A.
7 Ignition Off
Disconnect the Radiator Fan Relay Connector.
Disconnect the PCM Connector.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the Radiator Fan Relay Control Circuit to a good
ground.
Is the resistance below 5.0 ohms?All
Ye s®Repair the Radiator Fan Relay Control Circuit for a short to
ground.
Perform Powertrain Verification Test VER-5A.
No®Go To 8
8 Ignition Off
Disconnect the Radiator Fan Relay Connector.
Disconnect the PCM Connector.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the Radiator Fan Relay Control
Circuit from the Relay to the PCM.
Is the resistance below 5.0 ohms?All
Ye s®Go To 9
No®Repair the open Radiator Fan Relay Control Circuit.
Perform Powertrain Verification Test VER-5A.
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P-1491 RADIATOR FAN CONTROL RELAY CIRCUIT ÐContinued
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TEST ACTION APPLICABILITY
9 Ignition Off
Disconnect the PCM Connector.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire to the Radiator Fan Relay Control Circuit at the PCM.
Turn the ignition on.
Momentarily connect the other end of the jumper wire to a good ground.
Did the Radiator Fans actuate?All
Ye s®Go To 10
No®Replace the Radiator Fan Relay.
Perform Powertrain Verification Test VER-5A.
10 If there are no potential causes remaining, the PCM is assumed to be defective.
View repair options.All
Repair
Replace the PCM.
Perform Powertrain Verification Test VER-5A.
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P-1491 RADIATOR FAN CONTROL RELAY CIRCUIT ÐContinued
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Symptom:
P-1494 LEAK DETECTION PUMP PRESSURE SWITCH
When Monitored and Set Condition:
P-1494 LEAK DETECTION PUMP PRESSURE SWITCH
When Monitored: Immediately after a cold start, with ambient temperature between 4
deg C (40 deg F) and 32 deg C (90 deg F) and coolant temperature within ±12 deg C (10 deg
F) of ambient temperature.
Set Condition: The state of the switch does not change when the solenoid is energized.
POSSIBLE CAUSES
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
LDP PRESSURE SWITCH CIRCUIT SHORTED TO GROUND
LDP SWITCH SENSE CIRCUIT OPEN
LDP DEFECTIVE
LDP WIRING HARNESS INTERMITTENT DEFECT
LDP WIRING HARNESS OBSERVABLE DEFECT
LDP VACUUM HOSE LEAKING OR OBSTRUCTED
PCM DEFECTIVE
TEST ACTION APPLICABILITY
1 Start the engine and allow the engine to idle.
With the DRB, perform the Leak Detect Pump Test.
Select 1 to Pump.
Press the down arrow on the DRB several times.
The LEAK DETECT PUMP SW state should change from Open (UP) to CLOSED
(DN).
Did the Leak Detect Pump Switch state change as described?All
Ye s®Go To 2
No®Go To 4
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TEST ACTION APPLICABILITY
2 Ignition on, engine not running
With the DRB, read DTCs and Freeze Frame Data and record.
With the DRB, Clear DTCs.
Start the engine and allow the engine to idle.
With the DRB, perform the LDP Monitor test.
Wiggle the wiring harness and connectors from the LDP connector to the PCM
connector while the monitor is running.
Note: Be careful of the engine's moving parts.
With the DRB, Read DTCs.
Does the P-1494 Leak Detection Pump Sw or Mechanical Fault DTC return during
the wiggle test?All
Ye s®Repair the wiring harness or connector as necessary.
Perform Powertrain Verification Test VER-5A.
No®Go To 3
3 Ignition Off
Using the schematic as a guide, inspect the Wiring and Connectors.
Were any problems found?All
Ye s®Repair as necessary.
Perform Powertrain Verification Test VER-5A.
No®Test Complete.
4 Ignition Off
Disconnect the LDP Connector.
Note: Check connectors - Clean/repair as necessary.
Engine off, key on.
Using a voltmeter, probe the Fused Ignition Switch Output Circuit.
Is the voltage above 10.0 volts?All
Ye s®Go To 5
No®Repair the open Fused Ignition Switch Output Circuit.
Perform Powertrain Verification Test VER-5A.
5 Ignition Off
Disconnect the Engine Vacuum Supply Hose at the LDP.
Install a Vacuum Gauge to Engine Vacuum Supply Hose at the LDP.
Start engine and read Vacuum Gauge.
Does Vacuum Gauge read within 1 inch of engine vacuum?All
Ye s®Go To 6
No®Repair leak or obstruction in Vacuum Hose.
Perform Powertrain Verification Test VER-5A.
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P-1494 LEAK DETECTION PUMP PRESSURE SWITCH ÐContinued
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TEST ACTION APPLICABILITY
6 Ignition Off
Disconnect the LDP Connector.
Note: Check connectors - Clean/repair as necessary.
Disconnect the PCM.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the LDP Pressure Switch Sense
Circuit from the PCM Connector to a good ground.
Is the resistance below 5.0 ohms?All
Ye s®Repair the LDP Pressure Switch Sense Circuit for a short to
ground.
Perform Powertrain Verification Test VER-5A.
No®Go To 7
7 Ignition Off
Disconnect the LDP Connector.
Note: Check connectors - Clean/repair as necessary.
Disconnect the PCM.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the LDP Pressure Switch Sense
Circuit from the PCM Connector to the LDP Connector.
Is the resistance below 5.0 ohms?All
Ye s®Go To 8
No®Repair the open LDP Switch Sense Circuit.
Perform Powertrain Verification Test VER-5A.
8 Ignition Off
Disconnect the Engine Vacuum Supply Hose at the LDP.
Disconnect the PCM.
Note: Check connectors - Clean/repair as necessary.
Key on.
With voltmeter connected to LDP switch sense circuit at PCM connector, ground the
LDP solenoid control circuit. Then while applying vacuum to LDP with a hand
vacuum pump, observe voltmeter.
Did the voltage change?All
Ye s®Go To 9
No®Replace the LDP.
Perform Powertrain Verification Test VER-5A.
9 Ignition Off
If there are no potential causes remaining, the PCM is assumed to be defective.
View repair options.All
Repair
Replace the PCM.
Perform Powertrain Verification Test VER-5A.
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DRIVEABILITY
P-1494 LEAK DETECTION PUMP PRESSURE SWITCH ÐContinued
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Symptom:
P-1495 LEAK DETECTION PUMP SOLENOID CIRCUIT
When Monitored and Set Condition:
P-1495 LEAK DETECTION PUMP SOLENOID CIRCUIT
When Monitored: Immediately after a cold start, with ambient temperature between 4
deg C (40 deg F) and 32 deg C (90 deg F) and coolant temperature within ±12 deg C (10 deg
F) of ambient temperature.
Set Condition: The state of the solenoid does not change.
POSSIBLE CAUSES
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
LDP DEFECTIVE
LDP SOLENOID CKT WIRING HARNESS INTERMITTENT DEF
LDP SOLENOID CKT WIRING HARNESS OBSERVABLE DEFECT
LDP SOLENOID CONTROL CIRCUIT OPEN
LDP SOLENOID CONTROL CIRCUIT SHORT TO GROUND
PCM DEFECTIVE
NO POSSIBLE CAUSES REMAINING
TEST ACTION APPLICABILITY
1 Ignition On, Engine Not Running
With the DRB, actuate the LDP Pump Solenoid.
Is it clicking?All
Ye s®Go To 2
No®Go To 5
2 Ignition On, Engine Not Running.
With the DRB, actuate the LDP Solenoid.
While monitoring the LDP Switch state, wiggle Wiring Harness from the LDP
Solenoid to PCM.
Did the LDP Switch state ever change from up to down when wiggled?All
Ye s®Repair as necessary where wiggling caused problem to appear.
Perform Powertrain Verification Test VER-6A.
No®Go To 3
3 Ignition Off
Using the schematic as a guide, inspect the Wiring and Connectors.
Were any problems found?All
Ye s®Repair as necessary.
Perform Powertrain Verification Test VER-6A.
No®Go To 4
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TEST ACTION APPLICABILITY
4 Check the freeze frame data to determine the conditions when code was set.
Attempt duplication of 'freeze frame' conditions for added diagnostics.
If there are no other possible causes remaining there is assumed to be an9intermit-
tent9problem with a Wiring Harness Connector or Wire.
View repair options.All
Repair
Visually inspect related Wire Harness Connectors and Harnesses.
Look for broken, bent, pushed out, or corroded terminals and for
chafed, pierced, or partiallly broken wire, respectively. Refer to
any hotlines or technical service bulletins that apply.
5 Ignition Off
Disconnect the LDP Solenoid.
Note: Check connectors - Clean/repair as necessary.
Key on.
Using a Voltmeter, measure the voltage of the Fused Ignition Switch Output Circuit
at the Solenoid Connector.
Is the voltage above 10.0 volts?All
Ye s®Go To 6
No®Repair the open Fused Ignition Switch Output Circuit.
Perform Powertrain Verification Test VER-6A.
6 Ignition Off
Disconnect the LDP Solenoid.
Note: Check connectors - Clean/repair as necessary.
Disconnect the PCM.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the LDP Solenoid Control Circuit at
the PCM Connector to ground.
Is the resistance below 5.0 ohms?All
Ye s®Repair the LDP Solenoid Circuit for a short to ground.
Perform Powertrain Verification Test VER-6A.
No®Go To 7
7 Ignition Off
Disconnect the LDP Solenoid.
Note: Check connectors - Clean/repair as necessary.
Disconnect the PCM.
Note: Check connectors - Clean/repair as necessary.
With an Ohmmeter, measure the resistance of the LDP Solenoid Control Circuit from
the PCM Connector to the LDP Connector.
Is the resistance below 5.0 ohms?All
Ye s®Go To 8
No®Repair the open LDP Solenoid Control Circuit.
Perform Powertrain Verification Test VER-6A.
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P-1495 LEAK DETECTION PUMP SOLENOID CIRCUIT ÐContinued
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