LEMON Manuals: Even more car manuals for everyone
Home >> Volvo >> 1995 >> 850 GLT, 4D Sedan, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - Tests W/Codes - Non-Turbo - MOTRONIC 4.3) >> Circuit Tests >> DTC 4-5-1, 4-5-2, 4-5-3, 4-5-4, 4-5-5, 5-4-2, 5-4-3, 5-4-4, 5-4-5, 5-5-1, 5-5-2, 5-5-3, 5-5-4 & 5-5-5 - Misfire Detected

DTC 4-5-1, 4-5-2, 4-5-3, 4-5-4, 4-5-5, 5-4-2, 5-4-3, 5-4-4, 5-4-5, 5-5-1, 5-5-2, 5-5-3, 5-5-4 & 5-5-5 - Misfire Detected

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. Check for other DTCs. If any other DTCs are stored, perform diagnosis for other DTCs first. If no other DTCs are stored, go to next step.
  2. Read off all other misfiring DTCs. If DTC 5-4-2 and/or DTC 5-4-4 are stored, misfiring has occurred in more than one cylinder. If misfiring occurred in several cylinders, go to step 6). If misfiring occurred in ne cylinder, go to next step.
  3. Check all spark plugs, cylinder compression, cooling system, ignition wiring, and distributor cap and rotor. Repair as necessary. If all components are okay, use Volvo Scan Tool (998-8686998-8686 ) and check flywheel. Start engine and run at idle. Read off values on scan tool for FLY ADAP B, FLY ADAP C, FLY ADAP D, and FLY ADAP E. If readings are -97 to +97, check wiring and injector connectors. If any readings are incorrect, check RPM sensor tip and hole down by flywheel/connecting flange for damage, scratches, and metal particles. If RPM sensor and hole are okay, retest using new flywheel.
  4. Check wiring between relevant injector and ECM for signs of an intermittent open circuit, short circuit to ground, or intermittent short circuit to voltage. Also check suspect injector connector and ECM connector for poor terminal contact or oxidation. Repair as necessary, then go to next step.
  5. Check for air leakage in intake or exhaust system. Repair as necessary. If no air leakage is present, check fuel and residual pressure. Repair as necessary. If fuel and residual pressure are okay, system is operating normally.
  6. If misfiring is occurring in several cylinders, remove spark plugs and perform a compression test. Repair as necessary. If compression is okay, go to next step.
  7. Connect Pressure Tester (998 5496) to expansion tank. Pump up pressure to about 14.5 psi. Shine flashlight into each cylinder and ensure there is no leakage between cooling system and cylinders. If leakage is present, repair as necessary. If no leakage is present, go to next step.
  8. Remove all ignition wires. Check wires for cracks or arcing. Measure resistance in each ignition wire. Depending on length, resistance should be 1.5-4.5 k/ohms. Replace ignition wires as necessary. If wires are okay, go to next step.
  9. Remove distributor cap and rotor. Check distributor cap and rotor for cracks, arcing, or other signs of damage. Replace as necessary. If cap and rotor are okay, go to next step.
  10. Turn ignition off. Disconnect cable terminal from ignition coil connector terminal No. 15. Connect an ohmmeter between ignition coil terminals No. 1 and 15. If ohmmeter reads .5-1.5 ohms, go to next step. If ohmmeter does not read .5-1.5 ohms, retest using new ignition coil, then go to step 12).
  11. Turn ignition off. Disconnect ignition coil high tension wire. Connect an ohmmeter between ignition coil terminal No. 15 and high tension connector on ignition coil. If ohmmeter reads 8-9 k/ohms, go to next step. If ohmmeter does not read 8-9 k/ohms, retest using new ignition coil. Go to next step.
  12. Install new spark plugs. Install distributor cap and connect all ignition wiring. Connect cable terminal to ignition coil. Start engine and run at idle. Connect voltmeter between ignition coil connector terminal No. 15 and ground. If voltmeter reads battery voltage, go to next step. If voltmeter does not read battery voltage, check voltage supply connectors at junction box.
  13. Turn ignition off. Wait about 2 minutes. Disconnect power stage 4-pin connector. Connect ohmmeter between power stage connector terminal No. 1 and ground. If ohmmeter reads about zero ohms, go to next step. If ohmmeter does not read about zero ohms, check power stage ground connector for poor terminal contact. Repair as necessary, then go to next step.
  14. Check wiring between power stage connector terminal No. 4 and ECM terminal B11, wiring between power stage connector terminal No. 1 and ground, and wiring between power stage connector terminal No. 3 and battery voltage for an intermittent open circuit, short circuit to ground, or short circuit to voltage. Ensure all connectors are clean and tight. Repair as necessary, then go to next step.
  15. Start engine and run at idle. Using Volvo Scan Tool (998-8686 ), read off values on FLY ADAP B, FLY ADAP C, FLY ADAP D, and FLY ADAP E. If readings are -97 to +97, go to next step. If readings are not -97 to +97, check RPM sensor tip and hole down by flywheel/connecting flange for damage, scratches, and metal shavings. Repair as necessary. If RPM sensor and hole are okay, retest using new flywheel.
  16. Check wiring between injectors connector terminal No. 1 and main relay terminal No. 3, and wiring between ECM terminal A41 and main relay connector terminal No. 1 for an intermittent open circuit. Also check connectors at injectors, main relay, and ECM for loose connection. Repair as necessary. Go to next step.
  17. Check wiring between ECM terminal B27 and fuel pump relay connector terminal No. 4, wiring between fuel pump relay connector terminal No. 2 and ground, wiring between battery positive terminal and fuel pump connector terminal No. 1, wiring between fuel pump relay connector terminal No. 3 and fuel pump connector terminal No. 1, and wiring between fuel pump connector terminal No. 2 and ground. Also check all connectors for good terminal contact. Repair as necessary. Go to next step.
  18. Check intake and exhaust systems for air leakage. Check engine oil level. Check fuel and residual pressure. Repair as necessary. If all checks are okay, system is operating normally.
scientia non olet · About LEMON Manuals