Dodge ZB 2005 Service Manual page 1294

Symptom:
P1598-A/C PRESSURE SENSOR VOLTAGE TOO HIGH
When Monitored and Set Condition:
P1598-A/C PRESSURE SENSOR VOLTAGE TOO HIGH
When Monitored: With the engine running and the A/C Relay energized.
Set Condition: The A/C Pressure Sensor Signal at the PCM goes above 4.92 volts.
A/C PRESSURE SENSOR VOLTAGE ABOVE 4.9 VOLTS
A/C PRESSURE SENSOR
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO VOLTAGE
(C18) A/C PRESSURE SIGNAL CIRCUIT OPEN
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO (F888) 5-VOLT SUPPLY CIRCUIT
(K900) SENSOR GROUND CIRCUIT OPEN
PCM
TEST
1 NOTE: Ensure the A/C refrigerant System is properly charged per the
Service Information.
Ignition on, engine not running.
With the DRBIII , read DTCs and record the related Freeze Frame data.
Start the engine.
With the DRBIII , read the A/C Pressure Sensor voltage.
Is the voltage above 4.9 volts?
Yes → Go To 2
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
No
2 Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Connect a jumper wire between the (C18) A/C Pressure Signal circuit and the (K900)
Sensor ground circuit in the Sensor harness connector.
With the DRBIII , monitor the A/C Pressure Sensor voltage.
Ignition on, engine not running.
Is the voltage below 1.0 volt?
Yes → Replace the A/C Pressure Sensor.
→ Go To 3
No
NOTE: Remove the jumper wire before continuing.
POSSIBLE CAUSES
ACTION
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 2.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
DRIVEABILITY - GAS
173
APPLICABILITY
All
All