Engine Controls - Basic Testing: Other Chevrolet Prizm I

Compression

Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manual for specific instructions. For compression specifications, see appropriate SERVICE & ADJUSTMENT SPECIFICATIONS article.

Exhaust System Backpressure

Before replacing any components, check exhaust system for restrictions. Use a vacuum gauge or a low-pressure (0-5 psi) gauge to check exhaust system.

If a vacuum gauge is used, connect vacuum gauge hose to intake manifold vacuum port and start engine. Observe vacuum gauge. Partially open throttle and hold steady. If vacuum gauge reading slowly drops after stabilizing, exhaust system should be checked for a restriction. If using a low pressure gauge, proceed as follows

1. Check At Oxygen Sensor Remove oxygen sensor. Install backpressure tester in place of oxygen sensor. After test is completed, coat oxygen sensor threads with anti-seize compound before installation.

NO START-ENGINE CRANKS OKAY (1.0L)

Note. Before performing the following tests, check battery condition, engine cranking speed and for adequate fuel in tank.

Ignition System

1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
2. Using scan tool, check if Diagnostic Trouble Code (DTC) P0340 is present. If DTC P0340 is present, diagnose DTC. See appropriate SELF-DIAGNOSTICS article. If DTC P0340 is not present, go to next step.
3. Disconnect fuel injector electrical connectors. Disconnect spark plug wires from spark plugs. Install Spark Tester (J-26792) on each spark plug wire. Check for spark at each spark plug wire while cranking engine. If a strong, Blue spark is present at each spark plug wire, go to next step. If no spark or a weak spark is present, go to step 5 .
4. Check for fouled spark plugs. If spark plugs are fouled, replace as necessary. After repairs, go to step 27 . If spark plugs are okay, diagnose fuel injector circuit. See FUEL SYSTEM in appropriate SYSTEM & COMPONENT TESTING article.
5. Using DVOM, measure resistance of secondary wires. If resistance is 3000-6700 ohms per foot, go to next step. If resistance is not as specified, go to step 25 .
6. Check distributor cap and rotor for corrosion, cracks or water contamination. Replace as necessary. After repairs, go to step 27 . If distributor cap and rotor are okay, go to next step.
7. Install Spark Tester (J-26792) on ignition coil wire. Check for spark from ignition coil while cranking engine. If a strong, Blue spark is present, go to «DIAGNOSTIC AIDS»(ref-173-S40821185862000030800000) . If no spark or a weak spark is present, go to next step.
8. Turn ignition on with engine off. Using DVOM, measure voltage between ignition coil ignition feed circuit and ground. See appropriate wiring diagram in WIRING DIAGRAMS article. If battery voltage is present, go to step 10 . If battery voltage is not present, go to next step.
9. Repair open in ignition feed circuit to ignition coil. After repairs, go to step 27 .
10. Disconnect ignition coil harness connector. Using DVOM, measure primary and secondary resistance of ignition coil. Primary resistance should be 1.35-1.65 ohms at 68°F (20°C). Secondary resistance should be 22,100-29,900 ohms at 68°F (20°C). If resistance is as specified, go to step 12 . If resistance is not as specified, go to next step.
11. Replace ignition coil. After repairs, go to step 27 .
12. Reconnect ignition coil harness connector. Turn ignition on with engine off. Disconnect ignition control module harness connector. Using DVOM, measure voltage between ignition control module ignition feed circuit and ground. See appropriate wiring diagram in WIRING DIAGRAMS article. If battery voltage is present, go to step 14 . If battery voltage is not present, go to step 18 .
13. Check for an open or short in ignition feed circuit to ignition control module. Repair as necessary. After repairs, go to step 27 . If circuit is okay, go to step 19 .
14. Using a test light connected to ground, probe ground circuit at ignition control module harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step 16 . If test light does not illuminate, go to next step.
15. Repair open in ground circuit to ignition control module. After repairs, go to step 27 .
16. Using a test light connected to battery positive, probe ignition control module ignition trigger signal circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. Crank engine. If test light flashes from dim to bright, go to step 18 . If test light does not flash from dim to bright, go to next step.
17. Check for an open or short in ignition trigger signal circuit to ignition control module. Repair as necessary. After repairs, go to step 27 . If circuit is okay, go to step 26 .
18. Replace ignition control module. After repairs, go to step 27 .
19. Disconnect noise suppressor filter. Using DVOM, measure resistance between noise suppressor filter terminals No. 3 (Brown wire) and No. 4 (Brown/White wire). See appropriate wiring diagram in WIRING DIAGRAMS article. If resistance is about 2200 ohms, go to next step. If resistance is not as specified, go to step 24 .
20. Measure resistance between noise suppressor filter terminals No. 1 (Black/Blue wire) and No. 2 (Black/White wire), then between terminals No. 1 (Black/Blue wire) and No. 3 (Brown wire). See appropriate wiring diagram in WIRING DIAGRAMS article. If resistance is infinite for both measurements, go to next step. If resistance is not infinite for both measurements, go to step 24 .
21. Turn ignition on with engine off. Using DVOM, backprobe between noise suppressor filter terminal No. 2 (Black/White wire) and ground, then between noise suppressor filter terminal No. 4 (Brown/White wire) and ground. See appropriate wiring diagram in WIRING DIAGRAMS article. If battery voltage is present for both measurements, go to step 23 . If battery voltage is not present for both measurements, go to next step.
22. Repair open in Black/White wire (ignition feed circuit), or Brown/White wire between noise suppressor filter and ignition coil. After repairs, go to step 26 .
23. Repair any faulty electrical connections to ignition system components and recheck for spark. After repairs, go to step 27 .
24. Replace noise suppressor filter. After repairs, go to step 27 .
25. Replace any secondary wires not within specified resistance. After repairs, go to step 27 .
26. Replace PCM. After repairs, go to next step.
27. After repairs are complete, start engine and observe MIL. If MIL illuminates for about 3 seconds and turns off, system is okay. If MIL does not illuminate, or illuminates and does not turn off, see appropriate SELF-DIAGNOSTICS article.

Fuel System Electrical Circuit

1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
2. Remove fuel filler cap. Turn ignition on with engine off. Listen for operation of fuel pump at fuel filler pipe. Repeat ignition cycle as necessary. Fuel pump should operate for about 2 seconds. If fuel pump operates as specified, go to next step. If fuel pump does not operate, go to step 4 .
3. Remove fuel pump relay. Using a test light connected to battery positive, probe fuel pump relay control circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Crank engine. If test light illuminates, diagnose fuel system. See «BASIC FUEL SYSTEM CHECKS»(ref-173-S31830899862000030800000) . If test light does not illuminate, go to step 18 .
4. Turn ignition on with engine off. Remove fuel pump relay. Using a test light connected to ground, probe main relay circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 9 .
5. Turn ignition off. Connect a fused jumper wire between fuel pump power supply circuit and main relay circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Turn ignition on with engine off. Listen for operation of fuel pump. Repeat ignition cycle as necessary. If fuel pump operates, go to step 12 . If fuel pump does not operate, go to next step.
6. Leave jumper wire connected. Using a test light connected to ground, backprobe power supply circuit at fuel pump harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 10 .
7. Turn ignition off. Remove jumper wire. Disconnect fuel pump harness connector. Using a test light connected to battery positive, probe ground circuit at fuel pump harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 11 .
8. Replace fuel pump. After repairs, go to step 19 .
9. Repair open or short in main relay circuit between fuel pump relay and main relay. After repairs, go to step 19 .
10. Repair open or short in fuel pump power supply circuit between fuel pump and fuel pump relay. After repairs, go to step 19 .
11. Repair open or poor connection in fuel pump ground circuit between fuel pump and ground connection. After repairs, go to step 19 .
12. Turn ignition off. Remove jumper wire. Turn ignition on with engine off. Using a test light connected to ground, probe IG-COIL fuse circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 15 .
13. Using a test light connected to battery positive, probe fuel pump relay control circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Crank engine. If test light illuminates, go to step 16 . If test light does not illuminate, go to next step.
14. Using a test light connected to battery positive, backprobe fuel pump relay control circuit at PCM harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Crank engine. If test light illuminates, go to step 17 . If test light does not illuminate, go to step 18 .
15. Repair open or short in IG-COIL fuse circuit between fuel pump relay and junction block. After repairs, go to step 19 .
16. Replace fuel pump relay. After repairs, go to step 19 .
17. Repair open in fuel pump relay control circuit between fuel pump relay and PCM. After repairs, go to step 19 .
18. Replace PCM. After repairs, go to next step.
19. Operate vehicle under conditions in which problem originally occurred. If problem no longer exists, system is okay. If problem still exists, go to «DIAGNOSTIC AIDS»(ref-173-S40821185862000030800000) .

NO START-ENGINE CRANKS OKAY (1.3L)

Note. Before performing the following tests, check battery condition, engine cranking speed and for adequate fuel in tank.

1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
2. Using scan tool, check if Diagnostic Trouble Code (DTC) P0335 is present. If DTC P0335 is present, diagnose DTC. See appropriate SELF-DIAGNOSTICS article. If DTC P0335 is not present, go to next step.
3. Using scan tool, observe ENGINE SPEED parameter while cranking engine. If scan tool displays a steady value of 200-300 RPM, go to step 5 . If scan tool does not display specified value, go to next step.
4. Check Crankshaft Position (CKP) sensor ignition reference low circuit for a short to ground. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step 30 . If circuit is okay, go to step 29 .
5. Turn ignition on with engine off. Using scan tool, check data parameters on Engine Coolant Temperature (ECT) sensor, Throttle Position (TP) sensor and Manifold Absolute Pressure (MAP) sensor. Locate fault for any sensor reading not within expected values. Repair as necessary. After repairs, go to step 30 . If sensor values are okay, go to next step.
6. Disconnect fuel injector harness connectors. Install Spark Tester (J-26792) on No. 1 spark plug wire. Check for spark at spark plug wire while cranking engine. Repeat spark test on all spark plug wires. If a strong, Blue spark is present at each spark plug wire, go to next step. If no spark or a weak spark is present, go to step 13 .
7. Turn ignition off. Install Fuel Pressure Gauge (J-34730-1A). Cycle ignition on and off several times to obtain maximum fuel pressure. Turn ignition on with engine off. Fuel pump should operate for about 2 seconds. Observe fuel pressure with fuel pump running. Fuel pressure should be 39-44 psi (2.7-3.1 kg/cm 2 ). If fuel pressure is as specified, go to step 9 . If fuel pressure is not as specified, go to next step.
8. Turn ignition on with engine off. Fuel pump should operate for about 2 seconds. Observe fuel pressure. If fuel pressure is greater than one psi (.07 kg/cm 2 ), diagnose fuel system. See «BASIC FUEL SYSTEM CHECKS»(ref-173-S31830899862000030800000) . If fuel pressure is less than one psi (.07 kg/cm 2 ), go to «FUEL SYSTEM ELECTRICAL CIRCUIT»(ref-173-S33544279002000030800000) .
9. Check for contaminated fuel. Repair as necessary. After repairs, go to step 30 . If fuel is okay, go to next step.
10. Check for fouled or incorrectly gapped spark plugs. Repair or replace as necessary. After repairs, go to step 30 . If spark plugs are okay, go to next step.
11. Turn ignition off. Disconnect all fuel injector harness connectors. Install Injector Test Light (J-34730-2B) onto each fuel injector harness connector. Observe injector test light while cranking engine for each injector. If injector test light flashes for each injector, go to next step. If injector test light does not flash for each injector, diagnose fuel injector circuit. See FUEL SYSTEM in appropriate SELF-DIAGNOSTICS article.
12. Check for faulty fuel injectors. Replace as necessary. After repairs, go to step 30 . If fuel injectors are okay, go to step 27 .
13. Using DVOM, measure resistance of each spark plug wire. If resistance is 1200-3000 ohms per foot, go to next step. If resistance is not as specified, go to step 26 .
14. Check spark plug wires and ignition coil towers for corrosion, cracks, carbon tracking or water contamination. Repair as necessary. After repairs, go to step 30 . If spark plug wires and ignition coil towers are okay, go to next step.
15. Disconnect both spark plug wires from ignition coil supplying cylinders with no spark. Using DVOM, measure resistance of secondary coil winding. If resistance is 8500-11,500 ohms at 68°F (20°C), go to next step. If resistance is not as specified, go to step 28 .
16. Disconnect harness connector from ignition coil supplying cylinders with no spark. Turn ignition on with engine off. Connect a test light between ignition coil ignition feed circuit (harness side) and ground. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 21 .
17. Using a test light connected to battery positive, probe ignition coil ground circuit (harness side). See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 20 .
18. Turn ignition off. Connect DVOM to ignition coil ignition control circuit (harness side). See appropriate wiring diagram in WIRING DIAGRAMS article. Turn ignition on with engine off. Measure voltage. If voltage is 24-35 millivolts, go to next step. If voltage is not as specified, go to step 22 .
19. Observe DVOM while cranking engine. If voltage is 0.9-1.5 volts, go to step 25 . If voltage is not as specified, go to step 24 .
20. Repair open or faulty connection in ignition coil ground circuit. After repairs, go to step 30 .
21. Repair open in ignition coil ignition feed circuit. After repairs, go to step 30 .
22. Check for an open or short in ignition control circuit. Repair as necessary. After repairs, go to step 30 . If circuit is okay, go to next step.
23. Check for faulty harness connection at PCM. Repair as necessary. After repairs, go to step 30 . If connection is okay, go to next step.
24. Replace PCM. After repairs, go to step 30 .
25. Check for faulty harness connection at ignition coil. Repair as necessary. After repairs, go to step 30 . If connection is okay, go to next step.
26. Replace faulty ignition coil. After repairs, go to step 30 .
27. Check for the following engine mechanical problems: Worn or faulty camshaft. Leaking or sticking valves. Leaking or sticking piston rings. Excessive valve deposits. Collapsed or sticking lifters. Loose or worn rocker arms. Weak valve springs. Incorrect valve timing. Leaking head gasket. Repair as necessary. After repairs, go to step 30 . If no problem is found, go to «DIAGNOSTIC AIDS»(ref-173-S24307948512000030800000) .
28. Replace any faulty spark plug wires. After repairs, go to step 30 .
29. Replace CKP sensor. After repairs, go to next step.
30. Start engine and observe MIL. If MIL illuminates for about 1-2 seconds and then turns off, system is okay. If MIL does not illuminate or illuminates and does not turn off, see appropriate SELF-DIAGNOSTICS article.

1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
2. Remove fuel filler cap. Turn ignition on with engine off. Listen for operation of fuel pump at fuel filler pipe. Repeat ignition cycle as necessary. Fuel pump should operate for about 2 seconds. If fuel pump operates as specified, go to next step. If fuel pump does not operate, go to step 4 .
3. Remove fuel pump relay. Using a test light connected to battery positive, probe fuel pump relay control circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Crank engine. If test light illuminates, diagnose fuel system. See «BASIC FUEL SYSTEM CHECKS»(ref-173-S31830899862000030800000) . If test light does not illuminate, go to step 19 .
4. Turn ignition on with engine off. Remove fuel pump relay. Using a test light connected to ground, probe main relay circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 9 .
5. Turn ignition off. Connect a fused jumper wire between fuel pump power supply circuit and main relay circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Turn ignition on with engine off. Listen for operation of fuel pump. Repeat ignition cycle as necessary. If fuel pump operates, go to step 12 . If fuel pump does not operate, go to next step.
6. Leave jumper wire connected. Using a test light connected to ground, backprobe power supply circuit at fuel pump harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 10 .
7. Turn ignition off. Remove jumper wire. Disconnect fuel pump harness connector. Using a test light connected to battery positive, probe ground circuit at fuel pump harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 11 .
8. Remove fuel tank. Remove fuel sender assembly and inspect wire harness between fuel pump harness connector and fuel sender assembly. Repair as necessary. After repairs, go to step 20 . If wire harness is okay, go to step 18 .
9. Check for an open or short in White/Blue wire between main relay and fuel pump relay. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step 20 . If wire is okay, go to «MAIN RELAY CIRCUIT»(ref-173-S34873125252000030800000) .
10. Repair open or short in Pink wire between fuel pump harness connector and fuel pump relay. See appropriate wiring diagram in WIRING DIAGRAMS article. After repairs, go to step 20 .
11. Repair poor connection or open in fuel pump ground circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. After repairs, go to step 20 .
12. Turn ignition off. Remove jumper wire. Turn ignition on with engine off. Using a test light connected to ground, probe battery feed circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 15 .
13. Using a test light connected to battery positive, probe fuel pump relay control circuit at fuel pump relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Crank engine. If test light illuminates, go to step 16 . If test light does not illuminate, go to next step.
14. Using a test light connected to battery positive, backprobe fuel pump relay control circuit at PCM harness connector. Crank engine. If test light illuminates, go to step 17 . If test light does not illuminate, go to step 19 .
15. Repair open or short in IG-COIL fuse circuit between fuel pump relay and junction block. After repairs, go to step 20 .
16. Replace fuel pump relay. After repairs, go to step 20 .
17. Repair open in fuel pump relay control circuit between fuel pump relay and PCM. After repairs, go to step 20 .
18. Replace fuel pump. After repairs, go to step 20 .
19. Replace PCM. After repairs, go to next step.
20. Operate vehicle under conditions in which problem originally occurred. If problem no longer exists, system is okay. If problem still exists, refer to «DIAGNOSTIC AIDS»(ref-173-S24307948512000030800000) .

Main Relay Circuit

1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
2. Check for open IG-COIL fuse (15-amp) located in junction block, or open FI fuse (15-amp) located in fuse box. If either fuse is open, go to step 13 . If fuses are okay, go to next step.
3. Turn ignition on with engine off. Remove and reinstall main relay several times while listening for a "clicking" sound from relay. If a "clicking" sound is heard, go to «DIAGNOSTIC AIDS»(ref-173-S24307948512000030800000) . If relay does not click, go to next step.
4. Turn ignition off. Remove main relay. Turn ignition on with engine off. Using a test light connected to ground, probe battery feed circuit (cavity No. 4) at main relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 7 .
5. Using a test light connected to ground, probe battery feed circuit (cavity No. 1) at main relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 7 .
6. Turn ignition off. Using a test light connected to battery positive, probe main relay control (cavity No. 2) at main relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step 14 . If test light does not illuminate, go to step 8 .
7. Repair open in battery positive feed circuit between FI fuse and main relay. After repairs, go to step 16 .
8. Check for an open in main relay control circuit between main relay and PCM. Repair as necessary. After repairs, go to step 16 . If circuit is okay, go to next step.
9. Using a test light connected to ground, backprobe ignition positive voltage circuit at PCM harness connector C3. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step 11 . If test light does not illuminate, go to next step.
10. Repair open in ignition positive voltage circuit between IG-COIL fuse and PCM. After repairs, go to step 16 .
11. Disconnect PCM harness connector C1. Using a test light connected to battery positive, probe terminals No. 1, 13 and 26 (ground circuits). See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates at each terminal, go to step 15 . If test light does not illuminate at each terminal, go to next step.
12. Repair open in appropriate ground circuit. After repairs, go to step 16 .
13. Repair short to ground in IG-COIL fuse circuit or FI fuse circuit. After repairs, go to step 16 .
14. Replace main relay. After repairs, go to step 16 .
15. Replace PCM. After repairs, go to next step.
16. Operate vehicle under conditions in which problem originally occurred. If problem no longer exists, and no DTCs are present, system is okay. If DTCs are present, go to appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.

NO START-ENGINE CRANKS OKAY (1.8L)

Note. Before performing the following tests, check battery condition, engine cranking speed and for adequate fuel in tank.

1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
2. Check for power to IGN fuse and FI fuse. Check fuses for an open condition or poor terminal contact. Repair as necessary. After repairs, go to step 20 . If no problem is found, go to next step.
3. Using scan tool, check for Diagnostic Trouble Codes (DTCs). If DTC P0335 or P0340 is present, go to appropriate DTC test. See appropriate SELF-DIAGNOSTICS article. If DTC P0335 or P0340 is not present, go to next step.
4. If DTC P1300 or P1310 is present, go to appropriate DTC test. See appropriate SELF-DIAGNOSTICS article. If DTC P1300 or P1310 is not present, go to next step.
5. Turn ignition on with engine off. Using scan tool, monitor ECT sensor parameter. If ECT value displayed on scan tool is near actual coolant temperature, go to next step. If value displayed is not near actual coolant temperature, go to DTC P0115. See appropriate SELF-DIAGNOSTICS article.
6. Using scan tool, monitor TP sensor parameter with throttle closed. If TP value displayed on scan tool is 0-23 percent, go to next step. If value displayed is not as specified, go to DTC P0121. See appropriate SELF-DIAGNOSTICS article.
7. Using scan tool, monitor MAP sensor kPa reading. Compare MAP kPa reading with that of kPa reading from a known-good vehicle. If kPa reading from both vehicle is within 2 kPa of each other, go to next step. If kPa readings are not as specified, go to DTC P0106. See appropriate SELF-DIAGNOSTICS article.
8. Turn ignition off. Disconnect all fuel injector harness connectors. Connect fuel injector test light to each fuel injector harness connector and crank engine. If test light flashes for each fuel injector, go to next step. If test light does not flash for each fuel injector, diagnose fuel injector circuit. See FUEL SYSTEM in appropriate SYSTEM & COMPONENT TESTING article.
9. Install Spark Tester (J-26792) on No. 1 spark plug wire. Check for spark at spark plug wire while cranking engine. Repeat spark test on all spark plug wires. If a strong, Blue spark is present at each spark plug wire, go to step 11 . If no spark or weak spark is present, go to next step.
10. Remove ignition wires. Check for carbon tracking and damaged boots or insulation. Using DVOM, measure resistance at each ignition wire. If resistance is greater than 25,000 ohms or any damage is found, go to step 18 . If resistance is 25,000 ohms or less and condition of wires are okay, go to step 17 .
11. Remove spark plugs. Check for damage or fouled condition. Replace as necessary. After repairs, go to step 19 . If spark plugs are okay, go to next step.
12. Ensure vehicle has an adequate supply of fuel in fuel tank. Install fuel pressure gauge. Crank engine and observe fuel pressure gauge. If any pressure is indicated while cranking engine, go to next step. If no pressure is indicated, go to «FUEL SYSTEM ELECTRICAL CIRCUIT»(ref-173-S32168063512000030800000) .
13. Install scan tool. Turn ignition on with engine off. Using scan tool, command fuel pump relay on for 5 seconds. Observe fuel pressure gauge. If fuel pressure is 44-50 psi (3.1-3.5 kg/cm 2 ), go to next step. If fuel pressure is not as specified, diagnose fuel system. See «BASIC FUEL SYSTEM CHECKS»(ref-173-S31830899862000030800000) .
14. Check fuel for alcohol or contamination. Replace fuel as necessary. After repairs, go to step 19 . If fuel condition is okay, go to next step.
15. Check condition of all chassis, engine and PCM ground circuit connections. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step 19 . If ground connections are okay, go to next step.
16. Check for any of the following engine mechanical conditions: Worn or faulty camshaft. Leaking or sticking valves. Excessive valve deposits. Weak valve springs. Incorrect valve timing. Vacuum leaks. Broken or leaking piston rings. Leaking head gasket. Repair as necessary. After repairs, go to step 19 . If no engine mechanical problems are found, go to «DIAGNOSTIC AIDS»(ref-173-S08426486382000030800000) .
17. Replace ignition coil associated with cylinder which produced no spark. After repairs, go to step 19 .
18. Replace faulty spark plug wires. After repairs, go to next step.
19. Using scan tool, clear DTCs. Attempt to start engine. If engine starts and continues to run, go to next step. If engine does not start, or starts and stalls, go to step 2 .
20. Allow engine to reach normal operating temperature. Using scan tool, check for DTCs. If DTCs are present, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If DTCs are not present, system is okay.

1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
2. Turn ignition on with engine off. Using scan tool, command circuit opening relay on and off while listening for relay operation behind driver's side kick panel. If relay operation is heard, go to step 10) . If relay operation is not heard, go to next step.
3. Remove circuit opening relay. Ensure ignition is on. Using a test light connected to ground, probe cavities No. 2 and 3 (Black wires) at circuit opening relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates at both cavities, go to next step. If test light does not illuminate at both cavities, go to step 6) .
4. Using a test light connected to battery positive, probe circuit opening relay control circuit at circuit opening relay connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Using scan tool, command fuel pump on. If test light illuminates, go to step 8) . If test light does not illuminate, go to next step.
5. Check for an open in circuit opening relay control circuit. Repair as necessary. After repairs, go to step 9) . If circuit is okay, go to step 7) .
6. Check for cause of no ignition positive voltage to circuit opening relay. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step 9) .
7. Replace PCM. After repairs, go to step 9) .
8. Replace circuit opening relay. After repairs, go to next step.
9. Attempt to start engine. If engine starts and continues to run, go to step 17) . If engine does not start, or starts and stalls, go to next step.
10. Remove rear seat cushion. Turn ignition on with engine off. Place a listening device against fuel sender assembly access panel. Using scan tool, command fuel pump on. Listen for fuel pump operation. If fuel pump operation is heard, diagnose fuel system. See «BASIC FUEL SYSTEM CHECKS»(ref-173-S31830899862000030800000) . If fuel pump operation is not heard, go to next step.
11. Remove fuel sender assembly access panel. Disconnect fuel sender assembly harness connector. Using a test light connected to ground, probe fuel pump power feed circuit at fuel sender assembly harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. Using scan tool, command fuel pump on. If test light illuminates, go to next step. If test light does not illuminate, go to step 14) .
12. Using a test light connected to battery positive, probe fuel pump ground circuit at fuel sender assembly harness connector. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to step 15) . If test light does not illuminate, go to next step.
13. Repair open in fuel pump ground circuit. After repairs, go to step 17) .
14. Repair open in fuel pump power feed circuit between circuit opening relay and fuel sender assembly. After repairs, go to step 17) .
15. Check for an open in fuel pump power or fuel pump ground circuit (located inside fuel tank) between fuel pump and fuel sender assembly. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step 17) . If circuits are okay, go to next step.
16. Replace fuel pump. After repairs, go to next step.
17. Start engine and allow it to reach normal operating temperature. Using scan tool, check for DTCs. If any DTCs are present, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If no DTCs are present, system is okay.

BASIC FUEL SYSTEM CHECKS

Note. For fuel pump circuit testing, see appropriate FUEL SYSTEM ELECTRICAL CIRCUIT under NO START DIAGNOSIS .

FUEL SYSTEM PRESSURE RELIEF

Fuel system is under pressure. Pressure must be relieved prior to servicing fuel system. Fuel pressure may be relieved by using the following method.

1. Loosen fuel filler cap to relieve tank pressure (do not tighten at this time). On 1.8L, remove circuit opening relay. On 1.0L and 1.3L, remove fuel pump relay. On all models, start and run engine until it stalls. Crank starter for 3 seconds to remove remaining fuel from fuel lines. Turn ignition off. Reinstall circuit opening relay or fuel pump relay. Disconnect negative battery cable to avoid possible fuel discharge in accidental attempt to start engine.

1.0L

1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
2. Relieve fuel pressure. See «FUEL SYSTEM PRESSURE RELIEF»(ref-173-S37579549952000030800000) . Connect negative battery cable. Install Fuel Pressure Gauge (J-34730-1A). Turn ignition on with engine off. Fuel pump should run for about 2 seconds. If fuel pressure is present, go to next step. If fuel pressure is not present, go to step 10 .
3. Observe fuel pressure with fuel pump running. Record maximum fuel pressure. Cycle ignition on and off several times to establish an accurate reading. Fuel pressure reading should be 23-31 psi (1.6-2.2 kg/cm 2 ). If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to step 9 .
4. Turn ignition off. Observe fuel pressure for one minute after fuel pump stops. If fuel pressure remains stable at 13 psi (0.9 kg/cm 2 ) or greater, diagnose fuel pump electrical circuit. See appropriate FUEL SYSTEM ELECTRICAL CIRCUIT under «NO START DIAGNOSIS»(ref-173-S34536576002000030800000) . If fuel pressure does not remain stable as specified, go to next step.
5. Check for leaking fuel injector, or fuel feed pipes and hoses. Repair as necessary. After repairs, go to step 18 . If injector and fuel feed pipes and hoses are okay, go to next step.
6. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. Pinch fuel feed hose before fuel pressure gauge and check fuel pressure. If fuel pressure remains stable at 23 psi (1.6 kg/cm 2 ), go to step 17 . If fuel pressure does not remain stable as specified, go to next step.
7. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. Pinch fuel return hose and check fuel pressure. If fuel pressure remains stable at 23 psi (1.6 kg/cm 2 ) or greater, go to step 16 . If fuel pressure does not remain stable as specified, go to next step.
8. Check for leaking fuel injector, fuel pressure regulator or throttle body. Repair or replace as necessary. After repairs, go to step 18 .
9. If fuel pressure is less than 23 psi (1.6 kg/cm 2 ), go to next step. If fuel pressure is 23 psi (1.6 kg/cm 2 ) or greater, go to step 13 .
10. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. Pinch fuel return hose and check fuel pressure. Record maximum fuel pressure. Cycle ignition on and off several times to establish an accurate reading. If fuel pressure remains stable at 45 psi (3.2 kg/cm 2 ) or greater, go to step 16 . If fuel pressure does not remain stable as specified, go to next step.
11. Check for a restricted fuel feed pipe or fuel filter. Repair as necessary. After repairs, go to step 18 . If fuel feed pipe and fuel filter are okay, go to next step.
12. Check for leaks or restrictions in fuel pump hoses and connections in fuel tank. After repairs, go to step 18 . If hoses and connections are okay, go to step 17 .
13. If fuel pressure is greater than 30 psi (2.1 kg/cm 2 ), go to next step.
14. Turn ignition off. Relieve fuel pressure. See «FUEL SYSTEM PRESSURE RELIEF»(ref-173-S37579549952000030800000) . Disconnect fuel return hose from fuel pressure regulator. Connect a flexible hose to fuel pressure regulator and place other end in a container. Turn ignition on with engine off. Fuel pressure reading should be 23-31 psi (1.6-2.2 kg/cm 2 ). If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to step 16 .
15. Repair or replace restricted fuel return pipe or hose. After repairs, go to step 18 .
16. Fuel pressure regulator is faulty. Replace throttle body assembly. After repairs, go to step 18 .
17. Replace fuel pump. After repairs, go to next step.
18. Operate vehicle under conditions in which problem originally occurred. If problem no longer exists, system is okay. If problem still exists, diagnose fuel pump electrical circuit. See appropriate FUEL SYSTEM ELECTRICAL CIRCUIT under «NO START DIAGNOSIS»(ref-173-S34536576002000030800000) .

1.3L

1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
2. Relieve fuel pressure. See «FUEL SYSTEM PRESSURE RELIEF»(ref-173-S37579549952000030800000) . Install Fuel Pressure Gauge (J-34730-1A). Reconnect negative battery cable. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. If fuel pressure is present, go to next step. If fuel pressure is not present, go to step 13 .
3. Turn ignition off. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. Observe fuel pressure with fuel pump running. Record maximum fuel pressure. Cycle ignition on and off several times to establish an accurate reading. Fuel pressure reading should be 39-44 psi (2.7-3.1 kg/cm 2 ). If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to step 11 .
4. Turn ignition off. Observe fuel pressure for one minute after fuel pump stops. If fuel pressure remains stable at 29 psi (2.0 kg/cm 2 ) or greater, go to next step. If fuel pressure does not remain stable as specified, go to step 7 .
5. Start engine. If engine starts and continues to run, go to next step. If engine does not start, or starts and stalls, diagnose fuel injector circuit. See FUEL SYSTEM in appropriate SYSTEM & COMPONENT TESTING article.
6. Allow engine to reach normal operating temperature. observe fuel pressure gauge. Fuel pressure reading should be 29-35 psi (2.0-2.5 kg/cm 2 ). If fuel pressure is within specification, system is okay. If fuel pressure is not within specification, go to step 9 .
7. Check for leaking fuel injectors, fuel feed pipes and hoses. Repair as necessary. After repairs, go to step 19 . If injectors, fuel feed pipes and hoses are okay, go to next step.
8. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. Pinch fuel feed hose before fuel pressure gauge and check fuel pressure. If fuel pressure remains stable at 39 psi (2.7 kg/cm 2 ), go to step 18 . If fuel pressure does not remain stable as specified, go to next step.
9. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. Pinch fuel return hose and check fuel pressure. If fuel pressure remains stable at 39 psi (2.7 kg/cm 2 ) or greater, go to step 17 . If fuel pressure does not remain stable as specified, go to next step.
10. Check for leaking fuel injectors or fuel pressure regulator. Repair or replace as necessary. After repairs, go to step 19 .
11. If fuel pressure is less than 39 psi (2.7 kg/cm 2 ), go to next step. If fuel pressure is 38 psi (2.7 kg/cm 2 ) or greater, go to step 15 .
12. Turn ignition on with engine off. Fuel pump should run for about 2 seconds. Pinch fuel return hose and check fuel pressure. Record maximum fuel pressure. Cycle ignition on and off several times to establish an accurate reading. If fuel pressure remains stable at 64 psi (4.5 kg/cm 2 ) or greater, go to step 17 . If fuel pressure does not remain stable as specified, go to next step.
13. If fuel pump relay circuit has been diagnosed, go to next step. If fuel pump relay circuit has not been diagnosed, go to appropriate FUEL SYSTEM ELECTRICAL CIRCUIT under «NO START DIAGNOSIS»(ref-173-S34536576002000030800000) .
14. Check for a restricted fuel feed pipe or hose. Repair as necessary. After repairs, go to step 19 . If fuel feed pipe and hose are okay, go to step 18 .
15. Turn ignition off. Relieve fuel pressure. See «FUEL SYSTEM PRESSURE RELIEF»(ref-173-S37579549952000030800000) . Disconnect fuel return hose from fuel pressure regulator. Connect a flexible hose to fuel pressure regulator and place other end in a container. Turn ignition on with engine off. Fuel pressure reading should be 39-44 psi (2.7-3.1 kg/cm 2 ). If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, go to step 17 .
16. Repair or replace restricted fuel return pipe or hose. After repairs, go to step 19 .
17. Replace fuel pressure regulator. After repairs, go to step 19 .
18. Replace fuel pump. After repairs, go to next step.
19. Operate vehicle under conditions in which problem originally occurred. If problem no longer exists, system is okay. If problem still exists, diagnose fuel pump electrical circuit. See appropriate FUEL SYSTEM ELECTRICAL CIRCUIT under «NO START DIAGNOSIS»(ref-173-S34536576002000030800000) .

1.8L

1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
2. Relieve fuel pressure. See «FUEL SYSTEM PRESSURE RELIEF»(ref-173-S37579549952000030800000) . Install Fuel Pressure Gauge (J-34730-1A). Connect negative battery cable. Turn ignition on with engine off. Using scan tool, command fuel pump on. Observe fuel pressure with fuel pump running. If fuel pressure is present, go to next step. If fuel pressure is not present, go to step 5 .
3. Using scan tool, command fuel pump on. Observe fuel pressure with fuel pump running. Fuel pressure reading should be 44-50 psi (3.1-3.5 kg/cm 2 ). If fuel pressure is within specification, go to step 12 . If fuel pressure is not within specification, go to next step.
4. If fuel pressure is greater than 50 psi (3.5 kg/cm 2 ), go to step 22 . If fuel pressure is not greater than 50 psi (3.5 kg/cm 2 ), go to step 6 .
5. If circuit opening relay circuit has been diagnosed, go to step 24 . If circuit opening relay circuit has not been diagnosed, see appropriate FUEL SYSTEM ELECTRICAL CIRCUIT under «NO START DIAGNOSIS»(ref-173-S34536576002000030800000) .
6. Remove rear seat cushion. Turn ignition on with engine off. Place a listening device against fuel sender assembly access panel. Using scan tool, command fuel pump on. If fuel pump operation is heard, go to next step. If fuel pump operation is not heard, go to step 24 .
7. Turn ignition off. Disconnect fuel sender assembly harness connector. Using DVOM, measure resistance of fuel pump. See appropriate wiring diagram in WIRING DIAGRAMS article. If resistance is 0.2-0.3 ohms, go to next step. If resistance is not as specified, go to step 24 .
8. Check fuel feed pipe for kinks, cracks, incorrect routing or restrictions. Repair as necessary. After repairs, go to step 25 . If fuel feed pipe is okay, go to next step.
9. Remove fuel sender assembly. Check for clogged fuel pump strainer. If fuel pump strainer is clogged, go to step 23 . If fuel pump strainer is okay, go to next step.
10. Check "O" rings and seals between fuel pump, fuel filter and fuel pressure regulator for cracks, splits or deformities. Repair as necessary. After repairs, go to step 25 . If "O" rings and seals are okay, go to next step.
11. Check for restricted fuel filter. Replace as necessary. After repairs, go to step 25 . If fuel filter is okay, go to step 22 .
12. Using scan tool, command fuel pump on. Wait one minute for fuel pressure to stabilize. Monitor fuel pressure. If fuel pressure remains stable at 21 psi (1.5 kg/cm 2 ) or greater for 5 minutes after fuel pump turns off, go to next step. If fuel pressure does not remain stable as specified, go to step 17 .
13. If fuel pressure decreases during acceleration, cruise or hard cornering, go to next step. If fuel pressure remains steady during acceleration, cruise or hard cornering, see appropriate TROUBLE SHOOTING - NO CODES article.
14. Check for restrictions in fuel filter and fuel feed pipe. If a restriction is found, go to next step. If fuel filter and fuel feed pipe are okay, go to step 16 .
15. Repair restriction as necessary. After repairs, go to step 25 .
16. Check for restriction in fuel pump strainer, position of fuel pump pick-up, and if fuel pump is correct pump application for vehicle. Repair as necessary. After repairs, go to step 25 . If strainer, pick-up and fuel pump are okay, go to step 24 .
17. Using scan tool, pressurize fuel system. Pinch fuel feed hose at fuel pressure gauge. Turn fuel pump off. Wait 5 minutes and check fuel pressure. If fuel pressure remains stable at 21 psi (1.5 kg/cm 2 ) or greater, go to step 19 . If fuel pressure does not remain stable as specified, go to next step.
18. Check for leaks at base of fuel injectors, injectors or fuel rail. Repair as necessary. After repairs, go to step 25 . If no leaks are found, check fuel injectors. See FUEL SYSTEM in appropriate SYSTEM & COMPONENT TESTING article.
19. Check for leaks in fuel feed pipe. Repair as necessary. After repairs, go to step 25 . If fuel feed pipe is okay, go to next step.
20. Remove fuel sender assembly. Check "O" rings and seals between fuel pump, fuel filter and fuel pressure regulator for cracks, splits or deformities. Repair as necessary. After repairs, go to step 25 . If "O" rings and seals are okay, go to next step.
21. Check for cracks or a leaking seam in fuel filter and fuel pump. Replace as necessary. After repairs, go to step 25 . If fuel filter and fuel pump are okay, go to next step.
22. Replace fuel pressure regulator. Start engine. Monitor fuel pressure while engine is running. If fuel pressure is 44-50 psi (3.1-3.5 kg/cm 2 ), go to step 25 . If fuel pressure is not as specified, go to step 24 .
23. Replace fuel pump strainer. Check fuel system for cause of clogged fuel pump strainer. Repair as necessary. After repairs, go to step 25 .
24. Replace fuel pump. After repairs, go to next step.
25. Attempt to start engine. If engine starts and fuel pressure is 44-50 psi (3.1-3.5 kg/cm 2 ), system is okay. If fuel pressure is not as specified, go to step 2 .

Spark

Crank engine, checking for spark at coil wire and each spark plug wire using Spark Tester (J-26792). If spark exists at some spark plug wires, check for defective distributor cap and/or defective rotor. Check spark plug high tension wire resistance. Spark plug high tension wire resistance should be 3000-6700 ohms per foot. Replace spark plug high tension wires if resistance exceeds specification.

Ignition Coil Power Source

Turn ignition on. Check ignition positive voltage circuit at ignition coil for battery voltage. See appropriate wiring diagram in WIRING DIAGRAMS article. If battery voltage is not present, check ignition fuse. If fuse is not open, check for open in circuit between fuse and ignition coil.

Ignition Coil Resistance

Disconnect harness connector and ignition coil wire from ignition coil. Using DVOM, measure primary and secondary resistance. Primary coil resistance should be 1.35-1.65 ohms at 68°F (20°C). Secondary coil resistance should be 22,100-29,900 ohms at 68°F (20°C). Replace ignition coil if readings are not within specification.

Pick-Up Coil/Camshaft Position (CMP) Sensor

Measure pick-up coil/CMP sensor air gap. If gap is not .008-.016" (.20-.40 mm), adjust CMP sensor or replace distributor. Using DVOM, measure pick-up coil/CMP sensor resistance at appropriate distributor harness connector terminals. See appropriate wiring diagram in WIRING DIAGRAMS article. Pick-up coil/CMP sensor resistance should be 185-275 ohms at 14-122°F (-10-50°C). Replace CMP sensor if resistance is not within specification.

Crank engine and check for spark at coil wire and each spark plug wire using Spark Tester (J-26792). If spark exists at some spark plug wires, check for defective ignition coil tower. Check spark plug high tension wire resistance. On 1.3L, spark plug high tension wires resistance should be 1200-3000 ohms per foot. On 1.8L, resistance of spark plug high tension wires should not exceed 25,000 ohms. On all models, replace spark plug high tension wires if resistance exceeds specification.

Turn ignition on. Check ignition positive voltage circuit at ignition coil for battery voltage. See appropriate wiring diagram in WIRING DIAGRAMS article. If battery voltage is not present, check ignition fuse. If fuse is not open, check for open in circuit between fuse and ignition coil.

Note. For ignition coil testing on 1.8L, see NO START-ENGINE CRANKS OKAY (1.8L) under NO START DIAGNOSIS.

Ignition Coil Resistance (1.3L)

Connect DVOM across high voltage terminals of ignition coil. Using DVOM, measure resistance of secondary coil winding. Ignition coil secondary resistance should be 20,400-27,600 ohms at 68°F (20°C). Ignition coil primary resistance value is not supplied by manufacturer. Replace ignition coil if secondary resistance reading is not within specification.

IDLE SPEED & IGNITION TIMING

Ensure idle speed and ignition timing are set to specification. For specifications and adjustment procedures, see appropriate ON-VEHICLE ADJUSTMENTS article.

SUMMARY

If no faults were found while performing basic diagnostic procedures, or no trouble codes (or only intermittent ones) were found while performing On-Board Diagnostic (OBD) system check, and driveability problems still exist, proceed to appropriate TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO-START, etc.) or intermittent diagnostic procedures.