DTC 5-3-1
5-3-1 POWER STAGE GROUP APreconditions for DTCs
^ If the ECM registers a fault in any of the circuits for the injectors of the EVAP valve but cannot determine which circuit is faulty, DTC 5-3-1 is set.
Substitute value
^ Idle air trim is inhibited.
^ Fuel trim is inhibited.
^ Conditions for fuel shut-off altered.
Fault sources
^ Break in one of the injector voltage leads.
^ Break, short circuit to ground or short circuit to voltage supply in one of the injector signal leads.
^ Break in EVAP valve voltage lead.
^ Break, short circuit to ground or short circuit to voltage supply in EVAP valve signal lead.
^ Loose contact in one of the injector's, EVAP valve's or ECM's connectors.
Fault symptoms
^ Engine jerks during operation, depending on fault source.
^ Engine may stop during idling, depending on fault source.
TESTING PROCEDURE
Other DTCs
^ Read off other DTCs.
If one or more of DTCs 1-1-5, 1-2-5, 1-3-5, 1-4-5 or 1-5-5 is stored:
- See: Testing By Trouble Code / DTC 1-1-5 Injector 1, DTC 1-2-5 Injector 2, DTC 1-3-5 Injector 3, DTC 1-4-5 Injector 4 or DTC 1-5-5 Injector 5 as each is stored.
If DTC 5-4-1 is stored:
- See: Testing By Trouble Code / DTC 5-4-1 EVAP Valve Signal.
If none of the above DTCs is stored:
- Proceed to: Checking the Injectors section below.
Checking the Injectors
^ Use Diagnostic Test Mode 3 to check that the injectors operate properly.
^ For DTM 3 to work correctly, three injectors must be disconnected. This means that the test must be carried out several times with different injectors.
If the injectors function:
- Check the EVAP valve.
If the injectors do not function:
- Check the voltage supply to the injectors.
Checking the Voltage Supply to the Injectors
^ Switch Ignition OFF.
^ Disconnect the relevant injector.
^ Switch Ignition ON.
^ Connect a voltmeter between injector connector 1 and ground.
The voltmeter should show battery voltage.
If the reading is OK:
- Check the injector.
If the reading is incorrect:
- Check the lead between the main relay (2/32) connector 3 and injector connector 1 for signs of a break.
Checking the Injector
^ Switch Ignition OFF.
^ Relevant injector disconnected.
^ Connect an ohmmeter between connector 1 and 2 on the injector.
The ohmmeter should show approx. 14.5 ohms at +2O°C (68°F).
If the reading is OK:
- Check the signal lead.
If the reading is incorrect:
- Test with a new injector.
Checking the Signal Lead
^ Switch Ignition ON.
^ Relevant injector disconnected.
^ Connect a voltmeter between injector connector 2 and ground.
The voltmeter should show approx. 0 Volts.
If the reading is OK:
- Check the signal lead's resistance to ground.
If the reading is incorrect:
- Check the lead between injector connector 2 and ECM A10, ECM A38, ECM A24, ECM A23 or ECM A9 (depending on which injector does not work) for signs of short circuiting to voltage supply.
Checking the Signal Lead's Resistance to Ground
^ Switch Ignition OFF.
^ Wait for about 150 seconds.
^ Relevant injector disconnected.
^ Connect an ohmmeter between injector connector 2 and ground.
The ohmmeter should show 25 - 40K ohms.
If the reading is OK:
- The source of the DTC is poor contact in the injector connector.
- Rectify the connector with regard to loose connection, contact resistance and oxidation.
If the ohmmeter shows infinite resistance:
- Check the ECM's connector.
If the ohmmeter shows approx. 0 ohms:
- Check the lead between injector connector 2 and ECM A10, ECM A38, ECM A24, ECM A23 or ECM A9 (depending on which injector is not functioning) for signs of short circuiting to ground.
Checking the ECM's Connector
^ Switch Ignition OFF.
^ Relevant injector disconnected.
^ Rectify the ECM's connector with regard to contact resistance and oxidation.
^ ECM connected.
^ Connect an ohmmeter between injector connector 2 and ground.
The ohmmeter should show 25 - 40K ohms.
If the reading is OK:
- The source of the DTC is poor contact in the ECM's connector.
If the reading is incorrect:
- Check the lead between injector connector 2 and ECM A10, ECM A38, ECM A24, ECM A23 or ECM A9 (depending on which injector is not functioning) for signs of a break.
Checking the EVAP Valve
^ Use Diagnostic Test Mode (DTM) 3 to verify that the EVAP valve is working properly.
If the EVAP valve is OK:
- The fault is intermittent, proceed to INTERMITTENT FAULT section below.
If the EVAP valve is not OK:
- Check the voltage supply to the EVAP valve.
Checking the Voltage to the EVAP Valve
^ To gain access to the EVAP valve, remove the following:
- Valve from the bracket.
- Sound insulation from the valve.
- Refit the valve, hoses and sound insulation after the fault tracing process.
- For re-installation, use pliers P/N 9814215 and a new hose clamp.
^ Switch Ignition OFF.
^ Disconnect the EVAP valve.
^ Switch Ignition ON.
^ Connect a voltmeter between the EVAP valve connector 1 and ground.
The voltmeter should show battery voltage.
If the reading is OK:
- Check the EVAP valve.
If the reading is incorrect:
- Check the lead between EVAP valve connector 1 and the main relay (2/32) for signs of a break.
Checking the EVAP Valve
^ Switch Ignition OFF.
^ EVAP valve disconnected.
^ Connect an ohmmeter between connector 1 and 2 on the EVAP valve.
The ohmmeter should show approx. 26 ohms at +20°C (68°F).
If the reading is OK:
- Check the signal lead.
If the reading is incorrect:
- Test with a new EVAP valve.
Checking the Signal Lead
^ Switch Ignition ON.
^ EVAP valve disconnected.
^ Connect a voltmeter between EVAP valve connector 2 and ground.
The voltmeter should show approx. 0 Volts.
If the reading is OK:
- Check the signal lead resistance to ground.
If the reading is incorrect:
- Check the lead between EVAP valve connector 2 and ECM A39 for signs of short circuiting to voltage supply.
Checking the Signal Lead Resistance to Ground
^ Switch Ignition OFF.
^ Wait for about 150 seconds.
^ EVAP valve disconnected.
^ Connect an ohmmeter between EVAP valve connector 2 and ground.
The ohmmeter should show 25 - 40K ohms.
If the reading is OK:
- The source of the DTC is poor contact in the EVAP valve connector.
- Rectify the connector with regard to loose connections, contact resistance and oxidation.
If the ohmmeter shows infinite resistance:
- Check the ECM's connector.
If the ohmmeter shows approx. 0 ohms:
- Check the lead between EVAP valve connector 2 and ECM A39 for signs of short circuiting to ground.
Checking the ECM Connector
^ Switch Ignition OFF.
^ EVAP valve disconnected.
^ Rectify the ECM connector with regard to contact resistance and oxidation.
^ ECM connected.
^ Connect an ohmmeter between EVAP valve connector 2 and ground.
The ohmmeter should show 25 - 40K ohms.
If the reading is OK:
- The source of the DTC is poor contact in the ECM connector.
If the reading is incorrect:
- Check the lead between EVAP valve connector 2 and ECM A39 for signs of a break.
INTERMITTENT FAULT
Checking the Leads and Connectors
^ Check the leads between the main relay (2/32) connector 3 and injector connector 1 for signs of an intermittent break.
^ Check the leads between injector connector 2 and ECM A10, ECM A38, ECM A24, ECM A23, ECM A9 for signs of an intermittent break, intermittent short circuiting to ground as well as intermittent short circuiting to voltage supply.
^ Check the lead between main relay (2/32) connector 3 and EVAP valve connector 1 for signs of an intermittent break.
^ Check the lead between EVAP valve connector 2 and ECM A39 for signs of an intermittent break, intermittent short circuiting to ground as well as intermittent short circuiting to voltage supply.
^ Check the main relay's, injectors', EVAP valve's and ECM's connector for signs of a loose connection.