Dodge Dakota (R1). Manual — part 869
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
With the DRBIII
t, monitor the A/C Pressure Sensor voltage.
Turn the ignition on.
Is the voltage above .07 volts?
All
Yes
→
Replace the A/C Pressure Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
4
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the A/C Pressure Sensor Signal circuit in the A/C Pressure
Sensor harness connector to ground.
Is the resistance below 100 ohms?
All
Yes
→
Repair the A/C Pressure Sensor Signal circuit for a short to
ground.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
5
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the A/C Pressure Sensor Signal circuit and the
Sensor ground circuit in the A/C Pressure Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→
Repair the A/C Pressure Sensor Signal circuit for a short to the
Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
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 - 2.
7
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 5 Volt Supply circuit in the A/C Pressure Sensor
harness connector to ground.
Is the resistance below 100 ohms?
All
Yes
→
Repair the 5 Volt Supply circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
208
HEATING & A/C
P1599-A/C PRESSURE SENSOR VOLTS TOO LOW —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 5 Volt Supply circuit between the A/C Pressure Sensor
harness connector and the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
No
→
Repair the 5 Volt Supply circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
9
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.
10
NOTE: Ensure the A/C refrigerant System is properly charges per the
Service Information.
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 DRBIII
t
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 DRBIII
t Freeze Frame information. 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 POWERTRAIN VERIFICATION TEST VER - 2.
No
→
Test Complete.
209
HEATING & A/C
P1599-A/C PRESSURE SENSOR VOLTS TOO LOW —
Continued
Symptom:
*CHECKING A/C SYSTEM OPERATION WITH NO DTC’S
POSSIBLE CAUSES
A/C CLUTCH RELAY OUTPUT CIRCUIT OPEN
A/C COMPRESSOR CLUTCH GROUND CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
A/C CLUTCH COIL
A/C SELECT CIRCUIT OPEN
REFRIGERATION SYSTEM NOT PROPERLY CHARGED
A/C REQUEST CIRCUIT OPEN
CLUTCH CYCLING SWITCH
HIGH PRESS CUT-OFF SWITCH
LOW PRESSURE SWITCH
A/C CLUTCH RELAY
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, read DTC’s.
Is there an A/C Clutch Relay DTC?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the A/C compressor clutch harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the A/C Compressor Clutch Ground Circuit to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open A/C compressor clutch ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
3
Ignition on, engine not running.
With the DRBIII
t, read the A/C Select status.
Turn the A/C Switch on and off a few times.
Does the A/C Select state change?
All
Yes
→
No
→
Repair the open A/C Select Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
210
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Verify that the Refrigerant System is properly charged per service procedure.
Is the Refrigerant System properly charged?
All
Yes
→
No
→
Properly charge the Refrigerant System per the service informa-
tion.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
Turn the ignition on.
Turn the A/C system on and the fan on high.
With the DRBIII
t in Inputs/Outputs, read the A/C request state.
Does the A/C request state change?
All
Yes
→
No
→
6
Turn the ignition off.
Disconnect the A/C compressor clutch harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the A/C Compressor Clutch Ground Circuit to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open A/C compressor clutch ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
7
Ignition on, engine not running.
With the DRBIII
t, read the A/C Select status.
Turn the A/C Switch on and off a few times.
Does the A/C Select state change?
All
Yes
→
No
→
Repair the open A/C Select Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
8
Turn the ignition off.
Verify that the Refrigerant System is properly charged per service procedure.
Is the Refrigerant System properly charged?
All
Yes
→
No
→
Properly charge the Refrigerant System per the service informa-
tion.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
9
Turn the ignition on.
Turn the A/C system on and the fan on high.
With the DRBIII
t in Inputs/Outputs, read the A/C request state.
Does the A/C request state change?
All
Yes
→
No
→
211
HEATING & A/C
*CHECKING A/C SYSTEM OPERATION WITH NO DTC’S —
Continued
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