SAAB WIS ONLINE

DTC P0641-P0643, P0651-P0653, or P0697-P0699

DTC P0641-P0643, P0651-P0653, or P0697-P0699

Diagnostic Instructions


Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC P0641

5 V Reference 1 Circuit

DTC P0642

5 V Reference 1 Circuit Low Voltage

DTC P0643

5 V Reference 1 Circuit High Voltage

DTC P0651

5 V Reference 2 Circuit

DTC P0652

5 V Reference 2 Circuit Low Voltage

DTC P0653

5 V Reference 2 Circuit High Voltage

DTC P0697

5 V Reference 3 Circuit

DTC P0698

5 V Reference 3 Circuit Low Voltage

DTC P0699

5 V Reference 3 Circuit High Voltage

Circuit/System Description

The engine control module (ECM) has 3 x 5V reference circuits. The ECM provides the 5V reference to various sensors. Each reference circuit provides a 5V reference for greater than one sensor. An open circuit, short to ground, or short voltage on one of the 5V reference circuits can affect all the components connected to that 5V reference circuit. The ECM monitors the 5V reference circuit's voltage.

Conditions for Running the DTC


The ignition is ON for greater than 3 s.

DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 run continuously when the above condition is met.


Conditions for Setting the DTC

The 5 V reference circuit voltage is above or below a predetermined threshold for greater than 1 s or for a cumulative of 10 s.

Action Taken When the DTC Sets

DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 are Type A DTCs.

Diagnostic Aids


The 5 V reference 1, 2, and 3 circuits provide 5 V to the following sensors:

- B111 turbocharger pressure sensor terminal 3

- B157 secondary air injection pressure sensor terminal 1

- B37B engine oil pressure sensor terminal B

- B25B clutch pedal position (CPP) sensor, if equipped

- All four B23 camshaft position sensors terminal 3

- B107 accelerator pedal position (APP) sensor 1 terminal 2

- Q38 throttle position sensor 1 and 2 terminal E

- B26 crankshaft position sensor terminal 3

- B107 accelerator pedal position (APP) sensor 2 terminal 1

- B1 A/C refrigerant pressure sensor terminal 1

It may be possible to locate the fault by disconnecting one component at a time from the 5 V reference circuit while viewing the 5 V Reference circuit parameter on the scan tool. The scan tool parameter would change from Fault to OK when the source of the fault is disconnected.

If all 5 V reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.


Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference


Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Ignition ON, check the diagnostic trouble code (DTC) information with a scan tool. Diagnostic trouble codes P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698 or P0699 must not be generated.

2. Observe the appropriate scan tool 5 V Reference 1, 2, or 3 Circuit Status parameter. The parameter should display OK or Not Run.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.


Circuit/System Testing


1.
Note

Additional DTCs will set when disconnecting the components.


Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids.

2. Ignition ON, test for 4.8-5.2 V between one of the affected 5 V reference circuits and ground.

3. If the voltage is less than the specified range, test for a short to ground on the 5 V reference circuit for each of the affected components. If the circuit test normal, replace the K20 ECM.

4. If the voltage is greater than the specified range, test for a short to voltage on the 5 V reference circuit for each of the affected components. If the circuit test normal, replace the K20 ECM.

5.
Note

A short to voltage on the signal circuit of certain components may cause this DTC to set.


Connect each component associated with the affected 5 V reference circuit one at a time while monitoring the voltage. Verify the voltage remains between 4.8-5.2 V.

6. If not within the specified range when a component is connected, test the signal circuit of that component for a short to voltage. If the circuit tests normal, replace the component.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Turbocharger Pressure Sensor Replacement

Secondary Air Injection Pump Pipe Replacement for secondary air injection pressure sensor replacement

Engine Oil Pressure Sensor Replacement

Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake

Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust

Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake

Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust

Accelerator Pedal Position Sensor Replacement

Throttle Body Assembly Replacement

Crankshaft Position Sensor Replacement

Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LDK/A20NHT) Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (Diesel) Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LAU/A28NER)

Control Module References for ECM replacement, setup, and programming