600 L4-135 2.2L SOHC Turbo (1985)
Fuel Injector: Testing and Inspection
No Start Test (Ignition/Injectors)
Test 13, Checking System For Fault Codes
1.
Connect diagnostic read-out tool to engine test connector, then disconnect and reconnect battery quick disconnect.
2.
Crank engine for 7 seconds, then turn ignition switch off.
3.
Place system in Diagnostic Mode and record all codes.
4.
If no Code 88 is displayed, proceed to Test 14.
5.
If code sequence is 88-11-12-55, proceed to Test 15.
6.
If code sequence is 88-12-26-42-55 or 88-12-27-42-55, proceed to Test 16.
7.
If code sequence is 88-11-12-22-23-24-55, sensor ground circuit fault is present. Locate and repair open circuit in wire from red logic module
connector terminal No. 25.
8.
If code sequence is 88-12-26-55 or 88-12-27-55, replace power module.
CAUTION: Before replacing the power module make sure the terminals in cavity No. 6 of the 10-way connector are not spread apart so they
cannot touch the power module pin.
Test 14-Step A, No Fault Code 88 - Power Supply
1.
Turn ignition switch to Off position.
2.
Connect a digital voltmeter between blue logic module connector terminal No. 1 and ground, then turn ignition switch to Run position.
3.
If voltmeter reads at least 4.5 volts, proceed to Test 14 step B.
4.
If voltmeter no voltage, proceed to Test 14 step D.
Test 14-Step B, Battery Voltage at Logic Module
1.
Place ignition switch in off position.
2.
Connect voltmeter between terminal No. 2 of logic module blue connector and ground.
3.
If voltmeter reads within 1 volt of battery voltage, replace logic module.
CAUTION: Before replacing the logic module make sure the terminal in cavity No. 2 is not crushed so that it cannot touch the logic module
pin.
4.
If voltmeter indicates no voltage, proceed to Test 14 Step C.
Test 14-Step C, Battery Voltage at Power Module
1.
Turn ignition switch Off and disconnect 10-way connector from power module.
2.
Connect a voltmeter between terminal No. 4 of connector and ground.
3.
If voltmeter reads within 1 volt of battery voltage, replace power module.
CAUTION: Before replacing the power module make sure the terminal in cavity No. 4 is not spread apart so that it cannot touch the power
module pin. Also make sure the Z1 circuit (Cavity No. 6 of the power module 10-way connector) is not shorted to ground or damage to the new
power module will occur.
4.
If voltmeter indicates no voltage, locate and repair open in wire from terminal No. 4.
Test 14-Step D, Logic Module Ground Circuit
1.
Place ignition switch in Off position, then disconnect logic module red electrical connector.
2.
Connect an ohmmeter between terminal No. 24 of logic module red connector and ground.
3.
If ohmmeter indicates continuity, proceed to Test 14 step E.
4.
If ohmmeter does not indicate continuity, check wiring from terminal No. 24 for an open circuit.
Test 14-Step E, Checking For 8 Volts Power Supply
1.
Connect a voltmeter between terminal No. 23 of logic module connector and ground, then turn ignition switch to Run position.
2.
If voltmeter reads 7.5 to 9 volts, proceed to Test 14 step F.
3.
If voltmeter indicates no voltage, proceed to Test 14 step G.
Test 14-Step F, Checking For A Shorted MAP Sensor
1.
Turn ignition switch Off, then disconnect MAP sensor electrical connector.
2.
Connect a voltmeter between terminal No. 1 of logic module blue connector and ground, then turn ignition switch to Run position.
3.
If voltmeter reads 4.5 volts or more, replace MAP sensor.
