Symptom Charts

DESCRIPTION

- Starter cranks engine at normal speed but engine will not run.
- Refer to "ENGINE STALLS" if this symptom appears after engine stall. 4 Engine Stalls (After Start/at Idle)
- Fuel in tank.
- Battery in normal condition.

TEST 1

Is the pass Diagnostic Trouble Code displayed during Key On Engine Off inspection?

YES -- Pass Diagnostic Trouble Code displayed. Go to Test 2.

NO -- Diagnostic Trouble Code No. displayed or no Diagnostic Trouble Codes displayed. Check for cause.

TEST 2

Disconnect the Throttle Position Sensor connector. Is there correct voltage at terminal (BR/W) of the Throttle Position Sensor connector with the ignition switch On?

Specification: 4.0-6.0V

YES -- Go to Test 3.

NO -- Check voltage at Powertrain Control Module (PCM) terminals 1, 26, 37, and 57.

TEST 3

Is a strong blue spark visible at each disconnected high-tension lead while cranking engine?

Checking For Spark:

YES -- Go to Test 5.

NO -- Go to Test 4.

TEST 4

Is a strong blue spark visible at disconnected high-tension lead from coil while cranking engine?

YES -- Check as follows:
- Ignition Control Module
- Distributor Cap
- Rotor
- High-Tension Leads

NO -- Check the spark output signal and Camshaft Position Sensor signal at PCM.
- If OK, Go to Test 12.
- If not OK, check wiring harness.

TEST 5

Install Special Service Tool (SST) (Break Out Box) between wiring harness and PCM. Set the timing switch to the "COMPUTED" mode on the SST.

Is there correct voltage at pin 36 on the SST while cranking engine?

Specification: 3.0-6.0V

YES -- Go to Test 6.

NO -- Check the spark output signal and Camshaft Position Sensor signal at PCM.

TEST 6

Connect the jumper wire between FP terminal of Data Link Connector and a ground.

Is fuel line pressure correct when the ignition switch is cycled On and Off 5 times?

Fuel line pressure:
240-310 kPa (2.5-3.2 kgf/cm2 35-45 psi)

YES -- Go to Test 7.

NO -- Check Fuel Pump.

TEST 7

Visually look for fuel leakage at Injector 0-ring, pressure regulator, and fuel line. Service as necessary. Connect jumper wire between FP terminal of Data Link Connector and a ground.

Does fuel pressure specification for 60 seconds?

YES -- Go to Test 8.

NO -- Check pressure regulator diaphragm condition.
- If condition is OK, check Injector.
- If condition is not OK, replace pressure regulator.

TEST 8

Disconnect the Inertia Fuel Shutoff Switch connector. Crank engine for 5 sec. Does pressure drop more than 34 kPa (0.35 kgf/cm2, 5 psi) by the end of five second crank cycle?

YES -- Go to Test 9.

NO -- Check resistance of Injector(s) at PCM connector.
- If resistance is OK, check as follows:
- Injector drive signal
- Injection flow rate
- PCM
- If resistance is not OK, check as follows:
- Open circuit in Injector circuit

TEST 9

Does engine start when throttle valve held quarter open?

YES -- Check Idle Air Control Solenoid and wiring harness.

NO -- Go to Test 10.

TEST 10

Disconnect vacuum hose from Exhaust Gas Recirculation (EGR) valve and plug it.

Is drive symptom eliminated?

YES -- Check EGR vent on vacuum hose to EGR valve for obstruction or leak.

NO -- Go to Test 11.

TEST 11

Does EGR valve seat properly (fully closed)?

YES -- Go to Test 12.

NO -- Check as follows:
- EGR valve malfunction
- EGR flange gasket leaking
- EGR valve attaching nuts or bolts loose or missing
- EGR valve contamination
- EGR Vacuum Regulator Solenoid malfunction

TEST 12

Is there a restriction in exhaust system?

YES -- Check exhaust system.

NO -- Go Test 13.

TEST 13

Is engine compression correct?

YES -- Go to Test 14.

NO -- Check for causes.

TEST 14

Verify test results. If OK, return to diagnostic index to service any additional symptoms.
Symptom Index