Question about 1996 Volvo 850
OKAY, car started to sputter at about quarter to half throttle so I used the obsd it gave me code 2-1-4 (vss intermittent) after two hours completed all the tests my manual said to do, everything checked out I ws wondering if any one knew the ohms readings for the coil. (I plan on buying a knew vehicle speed sensor tomorrow just in-case it is that)
Vehicle speed sensors your problem. Engine and transmission management system need to know if the car is moving and how fast to make decisions on how much timing advance, fuel and which gear to select. You are wasting your time with the coil.
Posted on Apr 15, 2015
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Posted on Jan 02, 2017
code 204 is 'injector circuit cylinder 4'
U may want to bring it to another mechanic to have the problem checked. good luck, let me know how u make out.
Posted on Dec 15, 2008
This car won't start unless the gear is in the P position. Some times the sensor that tells the computer that the gear is in the P position doesn't make a good contact and the car won't start. Move the gear backwards and forwards until it makes a good contact and the car will start again.
Posted on Dec 22, 2009
Tips for a great answer:
Refer to Intermittent Conditions before starting.
Search for bulletins.
Observe the owners driving habits.
Test the fuel system circuits for proper operation. Refer to Fuel Pump Electrical Circuit Diagnosis .
Test for low fuel pressure. Refer to Fuel System Diagnosis .
Inspect for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
Inspect for fuel in the pressure regulator vacuum hose.
Ensure each injector harness is connected to the correct injector/cylinder.
Inspect for any items which may cause an engine to run rich, long term fuel trim is significantly in the negative range. Refer to Diagnostic Aids for DTC P0172 .
Inspect for any items which may cause an engine to run lean, long term fuel trim is significantly in the positive range. Refer to Diagnostic Aids for DTC P0171 .
Test for conditions which cause an incorrect idle speed.
Throttle body tampering, excessive deposits, or damage--Refer to Fuel System Description .
Restricted air intake system
Large vacuum leak
Inspect the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking especially between the MAF sensor and the throttle body.
Inspect crankcase ventilation valve for proper operation.
Inspect the throttle position (TP) sensor and related wiring. Refer to DTC P0123 .
Monitor the 24X crank sensor and the CMP sensor signal present parameters on the scan tool. If both are not responding, test the sensor feed circuit. Both sensors use a separate feed circuit but are internally connected to power. Test all CKP sensor A and CMP sensor circuits for intermittents. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Monitor the 3X parameter on the scan tool. If the 3X is not responding, inspect the CKP sensor B and circuits for intermittents. Inspect the ignition control (IC) circuit, IC timing control circuit, low resolution engine speed signal circuit and the low reference circuit for intermittents. If these circuits become open, or shorted, they may not set a diagnostic trouble code (DTC) immediately, but are capable of causing driveability complaints. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test the exhaust gas recirculation (EGR) system for proper operation. Refer to Exhaust Gas Recirculation (EGR) System Description .
Inspect the Transaxle Range Switch input with the vehicle in drive and the gear selector in drive or overdrive
Inspect for proper ignition voltage output using the following steps:
Attach the J 26792 Spark Tester to engine ground.
Connect the spark plug end of the spark plug wire to the J 26792 . Leave the other end of the spark plug wire connected to the coil being tested.
Connect the spark plug end of the companion spark plug wire to ground. The companion spark plug wire is the wire attached to the corresponding coil tower.
Crank the engine while observing the J 26792 . A spark should be observed.
Repeat the above steps for each coil.
If spark is not present at the coils, inspect for the following conditions:
Coils--Cracks, carbon tracking/arcing, or a resistance value outside the specified range
5000-8000 ohms (5K-8K ohms)
Spark plug wires--Signs of arcing, cross firing, cracks, carbon tracking, plug boot damage, pinched, improper routing, or a resistance value outside the specified range
Spark Plug Wire Resistance
9 686 ohms per meter (3,000 ohms per foot)
Important: : Spraying the secondary ignition wires with a light mist of water may help locate an intermittent problem. Ignition voltage will arc to ground when a secondary component is faulty.
Defective ignition module
Ignition system wiring--Loose ignition module feed or ground connection, or damaged system wiring
Remove spark plugs and inspect for the following conditions:
Burned or damaged electrodes
Improper heat range or reach
If spark plugs are gas or oil fouled, the cause of the fouling must be determined before replacing the spark plugs. Refer to Spark Plug Inspection .
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