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Home >> Volvo >> 1995 >> 850 GLT, 4D Sedan, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Engine Controls - Tests W/Codes - Non-Turbo (A/T) - MOTRONIC 4.4) >> Circuit Tests >> DTC 115, 125, 135, 145 & 155 - Fuel Injector Problem

DTC 115, 125, 135, 145 & 155 - Fuel Injector Problem

WARNING: This page is about a different car, the 1996 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
  1. If an injector circuit is shorted to ground or voltage, or if there is a break in the circuit, ECM interprets this as a fault and sets DTC for appropriate injector. If injector signal is too high, check for signal wire shorted to voltage or defective injector. If injector signal is too low, check for signal wire shorted to ground. If signal is missing, check for open circuit in signal or power lead, resistance in terminals, or defective injector.
  2. Check status message on Volvo Scan Tool (998-8686 ). If status message is PERMANENT FAULT, SIGNAL TOO HIGH, go to next step. If status message is PERMANENT FAULT, SIGNAL TOO LOW, go to step 4). If status message is PERMANENT FAULT, SIGNAL MISSING, go to step 5). If status message is INTERMITTENT FAULT, SIGNAL TOO HIGH or INTERMITTENT FAULT, SIGNAL TOO LOW, go to step 8). If status message is INTERMITTENT FAULT, SIGNAL MISSING, go to step 9).
  3. Turn ignition off. Disconnect injector connector. Connect ohmmeter between injector connectors No. 1 and 2. If ohmmeter does not indicate about 16 ohms, install new injector. If ohmmeter indicates about 16 ohms, check wiring between injector connector terminal No. 2 and ECM connector terminal A10 (DTC 115), A38 (DTC 125), A24 (DTC 135), A23 (DTC 145), or A9 (DTC 155) for a short to voltage.
  4. To check for a PERMANENT FAULT, SIGNAL TOO LOW, check wiring between injector connector terminal No. 2 and ECM connector terminal A10 (DTC 115), A38 (DTC 125), A24 (DTC 135), A23 (DTC 145), or A9 (DTC 155) for a short to ground.
  5. To check for a PERMANENT FAULT, SIGNAL MISSING, turn ignition off, disconnect injector, and turn ignition on. Connect voltmeter between injector connector terminal No. 1 and ground. If battery voltage is present, go to next step. If battery voltage is not present, check wiring between injector connector terminal No. 1 and main relay connector terminal No. 3 for an open circuit.
  6. Ensure ignition is on. Connect voltmeter between injector connector terminal No. 2 and ground. If voltmeter reads about 6 volts, go to next step. If voltmeter does not read about 6 volts, turn ignition off. Check ECM connector for good terminal contact. Reconnect ECM. Turn ignition on. Connect voltmeter between injector connector terminal No. 2 and ground. If voltmeter reads about 6 volts, fault was caused by poor ECM connector contact. If voltmeter does not read about 6 volts, check wiring between injector connector terminal No. 2 and ECM connector terminal A10 (DTC 115), A38 (DTC 125), A24 (DTC 135), A23 (DTC 145), or A9 (DTC 155) for an open circuit.
  7. Turn ignition off. Disconnect injector connector. Connect ohmmeter between injector connector terminals No. 1 and 2. If ohmmeter reads about 16 ohms, DTC is caused by poor contact in injector or ECM connector. If ohmmeter does not read about 16 ohms, replace injector.
  8. To check for an INTERMITTENT FAULT, SIGNAL TOO HIGH, check wiring between injector connector terminal No. 2 and ECM connector terminal A10 (DTC 115), A38 (DTC 125), A24 (DTC 135), A23 (DTC 145), or A9 (DTC 155) for an intermittent short to voltage. To check for an INTERMITTENT FAULT, SIGNAL TOO LOW, check wiring between injector connector terminal No. 2 and ECM connector terminal A10 (DTC 115), A38 (DTC 125), A24 (DTC 135), A23 (DTC 145), or A9 (DTC 155) for an intermittent short to ground.
  9. To check for an INTERMITTENT FAULT, SIGNAL MISSING, check injector and/or ECM connector for good terminal contact. Check wiring between injector terminal No. 1 and main relay No. 3 for an intermittent open circuit. Check wiring between injector connector terminal No. 2 and ECM connector terminal A10 (DTC 115), A38 (DTC 125), A24 (DTC 135), A23 (DTC 145), or A9 (DTC 155) for an intermittent open circuit.
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