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Dodge Viper SRT-10 (ZB). Manual - part 441

Symptom:

P1594-CHARGING SYSTEM VOLTAGE TOO HIGH

When Monitored and Set Condition:

P1594-CHARGING SYSTEM VOLTAGE TOO HIGH

When Monitored:

With the ignition key on and the engine speed greater than 0 RPM.

Set Condition:

When the PCM regulates the generator field and there are no detected

field problems, but the voltage output does not decrease.

POSSIBLE CAUSES

CHARGING SYSTEM OPERATION

(K20) GENERATOR FIELD CONTROL CIRCUIT SHORTED TO GROUND

GENERATOR FIELD COIL SHORTED TO GROUND

BATTERY TEMPERATURE SENSOR

PCM

TEST

ACTION

APPLICABILITY

NOTE: Battery must be fully charged and be capable of passing a load test.
Note: Generator Belt tension and condition must be checked before con-
tinuing.
Ignition on, engine not running.
With the DRBIII

t, read DTCs and the related Freeze Frame data then clear the

DTCs.
With DRBIII

t, actuate the Generator Field Driver.

With a 12-volt test light connected to ground, backprobe the (K20) Gen Field Control
circuit in the back of Generator Field harness connector.
Does the test light illuminate brightly and flash?

All

Yes

→ Go To 2

→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-

tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 3.

Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Generator Field Harness connector.
Carefully inspect the related connectors for corrosion or spread terminals before
continuing.
Measure the resistance between ground and the (K20) Generator Field Driver circuit
at the Generator Field harness connector.
Is the resistance below 100 ohms?

All

Yes

→ Repair the short to ground in the (K20) Generator Field Control

circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.

→ Go To 3

171

DRIVEABILITY - GAS

TEST

ACTION

APPLICABILITY

Measure the resistance between ground and the Generator Field terminals on the
Generator.
Is the resistance below 100 ohms?

All

Yes

→ Replace or repair the Generator Field Coil for a short to ground.

Perform POWERTRAIN VERIFICATION TEST VER - 3.

→ Go To 4

Connect the PCM harness connectors and the Generator harness connector.
Ignition on, engine not running.
With the DRBIII

t in Inputs/Outputs, read the Batt Temp Sensor value.

Using a thermometer measure under hood temperature near Battery tray.
Is the temperature within 10 deg of Battery temperature?

All

Yes

→ Go To 5

→ Replace the Battery Temperature Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 3.

NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.

All

Repair

Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 3.

172

DRIVEABILITY - GAS

P1594-CHARGING SYSTEM VOLTAGE TOO HIGH —

Continued

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.

POSSIBLE CAUSES

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

ACTION

APPLICABILITY

NOTE: Ensure the A/C refrigerant System is properly charged per the
Service Information.
Ignition on, engine not running.
With the DRBIII

t, read DTCs and record the related Freeze Frame data.

Start the engine.
With the DRBIII

t, read the A/C Pressure Sensor voltage.

Is the voltage above 4.9 volts?

All

Yes

→ Go To 2

→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-

tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 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

t, monitor the A/C Pressure Sensor voltage.

Ignition on, engine not running.
Is the voltage below 1.0 volt?

All

Yes

→ Replace the A/C Pressure Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 2.

→ Go To 3

NOTE: Remove the jumper wire before continuing.

173

DRIVEABILITY - GAS

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (C18) A/C Pressure Signal circuit in the A/C Pressure
Sensor harness connector.
Is the voltage above 5.2 volts?

All

Yes

→ Repair the short to voltage in the (C18) A/C Pressure Signal

circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.

→ Go To 4

Turn the ignition off.
Measure the resistance of the (C18) A/C Pressure Signal circuit between the A/C
Pressure Sensor harness connector and the PCM harness connector.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 5

→ Repair the open in the (C18) A/C Pressure Signal circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 2.

Measure the resistance between the (C18) A/C Pressure Signal circuit and the (F888)
5-volt Supply circuit in the A/C Pressure Sensor harness connector.
Is the resistance below 5.0 ohms?

All

Yes

→ Repair the short between the (F888) 5-volt Supply circuit and the

(C18) A/C Pressure Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.

→ Go To 6

Measure the resistance of the (K900) Sensor ground circuit from the A/C Pressure
Sensor harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 7

→ Repair the open in the (K900) Sensor ground circuit.

Perform POWERTRAIN VERIFICATION TEST VER - 2.

All

Repair

Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2.

174

DRIVEABILITY - GAS

P1598-A/C PRESSURE SENSOR VOLTAGE TOO HIGH —

Continued

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