Engine Controls - Service Manual Update, No Start Test
File In Section: 6E - Engine Fuel & EmissionBulletin No.: 71-65-17
Date: February, 1997
SERVICE MANUAL UPDATE
Subject:
Section 6E3 - Engine Controls - Revised Diagnostic Table A-3 Engine Cranks But Will Not Run
Models:
1996-97 Chevrolet Geo Tracker with 1.6L Engine (VIN 6 - RPO LO1)
This bulletin is being issued to revise the diagnostic Table A-3 Engine Cranks But Will Not Run in the following Service Manuals:
^ 1996 Geo Tracker Service Manual Book 2 - GMT/96-JE-2 pages 6E3-A-25, 6E3-A-26, 6E3-A-27 and 6E3-A-28
^ 1997 Geo Tracker Service Manual Book 2 - GMT/97-JE-2 pages 6E3-A-40, 6E3-A-41, 6E3-A-42 and 6E3-A-43
Diagnostic Aids
Check for any of the following conditions:
^ Water or foreign material can cause a no start during freezing weather. The engine may start after 5 or 6 minutes in a heated shop. The malfunction may not recur until an overnight park in freezing temperatures.
^ Fuel Pressure: Low fuel pressure can result in a very lean air/fuel ratio.
^ Fouled or damaged spark plugs will cause a Engine Cranks But Will Not Run condition. Refer to Ignition System section 6D4 for spark plug inspection.
^ Check for a faulty IG-COIL METER fuse.
^ Check for a short to ground in the PCM 5 volt reference circuit. The engine will not start or run if the 5 volt reference circuit is shorted to ground.
^ A short to ground in the BRN/WHT wire between the noise suppressor filter and the distributor could cause a no start condition, also check the resistance of the noise suppressor filter. Refer to Ignition System section 6D4.
An intermittent malfunction, may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals and a poor terminal-to-wire connections before component replacement.
Test Description
The numbers below refer to the step numbers in the Diagnostic Table.
1. The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
2. If a DTC P0340 is set, go to the DTC P0340 table first. If a problem still exists, continue diagnosis with the Engine Cranks But Will Not Run table.
3. This step checks for spark at the spark plugs.
5. This step checks for faulty Ignition wires.
8. This step checks the power and ground circuits to the distributor.
9. This step checks the power and ground circuits to the distributor. If the Ignition feed circuit is found not to have the proper voltage, check the Main relay (other symptoms should be noticed).
10. This step checks the primary circuit of the Ignition Coil which is located in the distributor.
11. This step checks the secondary circuit of the Ignition Coil which is located in the distributor.
12. Remove the orange retaining cap inside the connector and remove the control module drive input wire. Do not allow the wire to touch ground. After cranking the engine over and returning the ignition switch to the run position, the DMM voltage reading will rise to about 12 volts and then return to 0 volts. This should be considered normal operation.
13. After cranking the engine over and returning the ignition switch to the run position, the DMM voltage reading will rise to about 12 volts and then return to 0 volts. This should be considered normal operation.
A-3 Engine Cranks But Will Not Run