Engine Controls - Basic Testing: Diagnosis Dodge Intrepid I

VISUAL INSPECTION

Visually inspect all electrical wiring, looking for chafed, stretched, cut or pinched wires. Ensure electrical connectors fit tightly and are not corroded. Ensure vacuum hoses are properly routed and are not pinched or cut. See VACUUM DIAGRAMS article in the ENGINE PERFORMANCE section to verify routing and connections (if necessary). Inspect air induction system for possible vacuum leaks.

Relieving Fuel Pressure (Vehicles With Fuel Rail Test Ports)

Disconnect negative battery cable. Slowly open fuel tank cap to release pressure in tank. To release remaining pressure in system, remove fuel rail pressure test port cap. Place open end of Fuel Pressure Release Hose (C-4799-A) in approved gasoline container. Connect other end of pressure release hose to test port. Fuel pressure will bleed-off into container.

FUEL PUMP & FUEL PRESSURE REGULATOR TEST

Spark Test

1. Remove spark plug cable from cylinder No. 2. Insert a known-good spark plug into spark plug cable. Ground spark plug on engine. Crank engine and check for spark. Repeat procedure at remaining cylinders.
2. If no spark or an irregular, weak spark is present at one or more spark plug cables, go to IGNITION COIL RESISTANCE TEST. If no spark is present, go to NO-START TEST.

No-Start Test

1. Ensure battery is fully charged (at least 12.6 volts). Disconnect coil electrical connector. Connect a test light to coil electrical connector terminal B+ (Dark Green/Black wire). (Scheme 51)
2. Turn ignition switch to ON position. Test light should momentarily flash on and off. If test light does not momentarily flash on and off, ASD relay has failed to energize. Check ASD relay and related circuits. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section listed below. «TESTS W/CODES - 2.2L»(ref-10830) «TESTS W/CODES - 2.5L TBI»(ref-10831) «TESTS W/CODES - 2.5L FLEX FUEL»(ref-10825) «TESTS W/CODES - 3.0L»(ref-10826) «TESTS W/CODES - 3.3L»(ref-10827) «TESTS W/CODES - 3.5L»(ref-10832)
3. If test light momentarily flashes on and off, PCM has grounded Auto Shutdown (ASD) relay. Go to next step. DO NOT turn ignition off at this time.
4. Crank engine, and observe test light. If ignition was turned off at end of step 3), turn ignition switch to ON position, wait for test light to flash once, and then crank engine.
5. If test light momentarily flashes during cranking, engine controller is not receiving a camshaft sensor signal. Check camshaft sensor and related sensor circuits. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section listed below. «TESTS W/CODES - 2.2L»(ref-10830) «TESTS W/CODES - 2.5L TBI»(ref-10831) «TESTS W/CODES - 2.5L FLEX FUEL»(ref-10825) «TESTS W/CODES - 3.0L»(ref-10826) «TESTS W/CODES - 3.3L»(ref-10827) «TESTS W/CODES - 3.5L»(ref-10832)
6. If test light does not flash during cranking, disconnect camshaft sensor connector. Turn ignition switch to OFF and then to ON position. Wait for test light to momentarily flash once, and then crank engine.
7. If test light momentarily flashes, camshaft sensor is shorted and must be replaced. If test light does not flash, no-start condition is caused by problem in crankshaft or camshaft sensor 9-volt power supply circuit or by crankshaft sensor 5-volt output or ground circuits. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section listed below. «TESTS W/CODES - 2.2L»(ref-10830) «TESTS W/CODES - 2.5L TBI»(ref-10831) «TESTS W/CODES - 2.5L FLEX FUEL»(ref-10825) «TESTS W/CODES - 3.0L»(ref-10826) «TESTS W/CODES - 3.3L»(ref-10827) «TESTS W/CODES - 3.5L»(ref-10832)

Scheme 51

Ignition Coil Resistance Test

1. Remove ignition cables, and measure their resistance (3000-12,000 ohms per foot). Replace cable(s) if necessary. Disconnect ignition coil harness connector. Measure primary coil resistance between B+ (battery) terminal and pin corresponding to cylinder(s) in question. (Scheme 51)
2. Measure secondary coil resistance between coil towers of grouped cylinders. See CYLINDER GROUP IDENTIFICATION table. Replace ignition coil if primary/secondary coil resistance is not as specified. See IGNITION COIL RESISTANCE table under IGNITION COIL.

CYLINDER GROUP IDENTIFICATION

See SPARK TEST under OPTICAL IGNITION SYSTEM (3.0L).

See also:
• COMPUTER RELEARN PROCEDURES
• ADJUSTMENTS