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Home >> Volvo >> 1995 >> 960 L6-3.0L VIN 95 B6304F >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> EFI / DTC Codes (Engine Control System) >> DTC 1-1-3

DTC 1-1-3

1-1-3 INJECTOR GROUP 1




Trouble Code Conditions
If the injector group circuit is shorted to ground/live, or if there is a break in the circuit, the Engine Control Module (ECM) notes this as a fault and sets Diagnostic Trouble Code (DTC) 1-1-3.

Substitute value(s)
- ECM shuts off faulty injector group.
- Fuel trim inhibited.

Fault source(s)
Signal too high:
- Signal lead short circuit to live.
- Injection valve defect.

Signal too low:
- Power lead broken.
- Signal lead short circuit to ground.
- Contact resistance in terminals.
- Injection valve defect.

Current too low:
- Signal lead broken.
- Contact resistance in terminals.
- Injection valve defect.

Fault symptom(s)
- Engine is running on 3 cylinders.
- Engine does not start.

TEST PROCEDURE




STATUS REPORT
^ Signal too high:
- Proceed to SIGNAL TOO HIGH section below.

^ Signal too low:
- Proceed to SIGNAL TOO LOW section below.

^ Current too low:
- Proceed to CURRENT TOO LOW section below.

SIGNAL TOO HIGH
- Start engine
- Test engine start.

If engine runs on 3 cylinders:
^ Check injection valves. Proceed to CHECK INJECTION VALVES section below.

If engine runs on 6 cylinders:
^ Intermittent fault, signal too high. Proceed to INTERMITTENT FAULT, SIGNAL TOO HIGH section below.




CHECK INJECTION VALVES
- Ignition off.
- Disconnect injection valves 1, 2 and 4.
- Connect an ohmmeter between injection valves connectors 1 and 2 for each injection valve in turn.

The ohmmeter should read approx. 16 ohms for each injection valve.

If injection valves are OK:
^ Check lead between injection valves and ECM # 17 for short circuit to live.

If values are different:
^ Test with new injection valve.

SIGNAL TOO LOW
- Start engine
- Test engine start.

If engine does not start or runs on 3 cylinders:
^ Check power lead. Proceed to CHECK POWER LEAD section below.

If engine runs on 6 cylinders:
^ Intermittent fault, signal too low. Proceed to INTERMITTENT FAULT, SIGNAL TOO LOW section below.

CHECK POWER LEAD
- Ignition off.
- Disconnect injection valves 1, 2 and 4.



- Ignition on.
- Connect a voltmeter between injection valve connector terminal 1 and ground for each injection valve in turn.

The voltmeter should indicate battery voltage.

If values OK:
^ Check signal lead resistance to ground. Proceed to CHECK SIGNAL LEAD RESISTANCE TO GROUND section below.

If values differ:
^ Check fuse 5 (11B/5) in central relay unit.

If fuse OK:
^ Check lead between injection valves and main relay 2/32 terminal 3 for break.

If fuse broken:
^ Check lead between injection valves and fuse 5 for short circuit to ground.




CHECK SIGNAL LEAD RESISTANCE TO GROUND
- Ignition off.
- Injection valves 1, 2 and 4 disconnected.
- Connect an ohmmeter between injection valve terminal 2 and ground for each injection valve in turn.

The ohmmeter should read approx. 0.8 ohms.

If values OK:
^ Check injection valves. Proceed to CHECK INJECTION VALVES section below.

If values differ:
^ Check lead between injection valves and ECM # 17 for short circuit to ground.




CHECK INJECTION VALVES
- Ignition off.
- Injection valves 1, 2 and 4 disconnected.
- Connect an ohmmeter between injection valve connectors 1 and 2 for each injection valve in turn.

The ohmmeter should read approx. 16 ohms for each injection valve.

If injection valves OK:
^ The DTC has a bad contact in the injection valve connector. Fix bad contact in injection valve connector, contact resistance and oxidation.

If value differs:
^ Test with new injection valve.

CURRENT TOO LOW
- Start engine.
- Test engine start.

If engine runs on 3 cylinders:
^ Check injection valves. Proceed to CHECK INJECTION VALVES section below.

If engine runs on 6 cylinders:
^ Intermittent fault, current too low. Proceed to INTERMITTENT FAULT, CURRENT TOO LOW section below.




CHECK INJECTION VALVES.
- Ignition off.
- Disconnect injection valves 1, 2 and 4.
- Connect an ohmmeter between injection valve connector terminals 1 and 2 for each injection valve in turn.

The ohmmeter should read approx. 16 ohms for each injection valve.

If values OK:
^ Check leads. Proceed to CHECK LEADS section below.

If valves differ:
^ Test with new injections valve.




CHECK LEADS
- Ignition off.
- Connect an ohmmeter between terminal 2 on connector to injection valve 1 and terminal 2 of connector to injection valve 2.
- Repeat between injection valves 1 and 4.

The ohmmeter should read approx. 0 ohms for both.

If values OK:
^ Check connector. Proceed to CHECK CONNECTOR section below.

If values differ:
^ Check engine wiring between injection valves for break.




CHECK CONNECTOR
- Ignition off.
- Injection valves 1, 2 and 4 disconnected.
- Check ECM connector and 55-pin connector in central relay unit (A3/F) terminal 10 for contact resistance and oxidation.
- Connect breakout box and check control points.



- Connect an ohmmeter between # 19 and # 17 on breakout box.

The ohmmeter should read approx 1 k ohm.

If value OK:
^ Check injection valves. Proceed to CHECK INJECTION VALVES section below.

If ohmmeter reads infinite resistance:
^ Check lead between ECM # 17 and injection valves for break.




CHECK INJECTION VALVES
- Ignition off.
- Injection valves 1, 2 and 4 disconnected.
- Connect an ohmmeter between injection valve connector 1 and 2 for each injection valve in turn.

The ohmmeter should read approx. 16 ohms for each injection valve.

If injection valves OK:
^ Source of DTC is bad contact in injection valve connector. Check connectors for loose connection as well as contact resistance and oxidation.

If value differs:
^ Test with new injection valve.




INTERMITTENT FAULT, SIGNAL TOO HIGH
Check leads and terminals
- Check lead between injection valves terminal 2 and ECM # 17 for intermittent short circuit to live.




INTERMITTENT FAULT, SIGNAL TOO LOW
Check leads and terminals
- Check injection valve and ECM connector for loose connection as well as contact resistance and oxidation.
- Check lead between injection valves terminal 2 and ECM # 17 for intermittent short circuit to ground.
- Check lead between injection valves terminal 1 and main relay for intermittent break.




INTERMITTENT FAULT, CURRENT TOO LOW
Check leads and terminals
- Check lead between injection valve terminal 2 and ECM # 17 for intermittent break.
- Check 55-pin connector in central relay unit (A3/F) terminal 10, injection valve and ECM connector for loose connection, as well as contact resistance and oxidation.

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