KEY ON, ENGINE OFF (KOEO) SELF-TEST
Note. Do not move throttle during KOEO self-test.
1) This is a test of electronic engine control system, conducted with power (voltage) applied and engine not running. Enter self-test. Record all codes displayed.
2) Erase codes. Repeat self-test. Diagnose only codes occurring during repeat self-test. See TROUBLE CODE IDENTIFICATION table. If no codes are present, proceed to KEY ON, ENGINE RUNNING (KOER) SELF-TEST below.
KEY ON, ENGINE RUNNING (KOER) SELF-TEST
Note. It is necessary to clear codes in memory before performing this test. Do not move throttle during test.
1) Deactivate self-test. Start and run engine at 2000 RPM for 3 minutes to warm up O2S. Turn off engine and wait 10 seconds.
2) Restart engine, and activate self-test. Record all service codes displayed. See TROUBLE CODE IDENTIFICATION table. If no codes are present, proceed to SWITCH MONITOR TEST.
SWITCH MONITOR TEST
Note. All switches must be tested individually. Allowing a switch to remain on while testing another will lead to false test results.
This test procedure checks input signals received by PCM from individual switches. Use following procedure to perform switch monitor test
- Turn engine off and allow it to cool.
- Turn all accessories off.
- Deactivate self-test.
- Ensure transmission lever is in Neutral or Park.
- Turn ignition on.
Inspecting Circuitry
1) Visually inspect suspected sensor, switch, or solenoid. Enter WIGGLE TEST if using NGS or Super Star II tester. If using VOM, connect it to STO terminal on self-test connector, and ground STI self-test connector terminal. Lightly tap suspected sensor, switch, or solenoid.
2) Push and pull on suspected sensor, switch, or solenoid connector, but do not unplug it. Test and wiggle harness vigorously, working in small sections, from suspected device toward dash panel, and from dash panel to PCM.
3) If VOM, NGS, or Super Star II tester does not display a positive indication of an intermittent defect, carefully disconnect suspected device. Remove terminals from connector.
4) Inspect terminals at both ends for corrosion, bad crimps, or improperly seated terminals. Reconnect after inspection. Unplug harness from PCM.
5) Inspect PCM and harness connector terminals for corrosion, bad crimps, or improperly seated terminals. If VOM does not indicate any intermittent defect, reconnect wiring and erase codes.
PINPOINT TEST CMP - CAMSHAFT POSITION SENSOR
Note. Enter this test only when Code 03 is displayed during QUICK TESTS procedure, or when directed here from another PINPOINT TEST.
Identifying CMP Circuit & Connectors. Scheme 1
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| CMP | 2G | 24 | GRN/RED |
| GND | 2C | 16 | BLK/LT GRN |
| VPWR | 1B | 37,57 | YEL/WHT |
CMP CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB. Reconnect PCM. Measure voltage at BOB test pin 24 while bumping starter. If voltage does not alternate between about zero and 5 volts, go to next step. If voltage alternates as specified, CMP circuit is okay. Return to QUICK TESTS if sent here from there; otherwise temporarily substitute known good PCM and repeat test to check for improvement.
2) Turn ignition off. Unplug 6-pin distributor connector. Turn ignition on. Measure voltage on VPWR (Yellow/White) wire at harness connector. If voltage is greater than 10 volts, go to next step. If voltage is not greater than 10 volts, repair VPWR wire to distributor.
3) Turn ignition off. Measure resistance between GND (Black/Lt. Green) wire at harness connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, repair Black/Lt. Green wire to ground.
4) Turn ignition off. Install BOB, leaving PCM disconnected. Measure resistance between BOB test pin 24 and CMP wire (Green/Red) at harness connector. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, repair Green/Red wire.
5) Turn ignition off. Install BOB, leaving PCM disconnected. Measure resistance between BOB test pin 24 and ground. Measure resistance between CMP (Green/Red) wire and each other wire at harness connector. If all measurements are greater than 10,000 ohms, replace distributor. If any measurement is not greater than 10,000 ohms, repair wire in question.
PINPOINT TEST CKP - CRANKSHAFT POSITION SENSOR
Note. Enter this test only when Code 04 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST.
Identifying CKP Circuit & Connector. Scheme 2
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| CKP | 2E | 56 | GRN/BLK |
| GND | 2C | 16 | BLK/LT GRN |
| VPWR | 1B | 37, 57 | YEL/WHT |
CKP CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB. Reconnect PCM. Measure voltage at BOB test pin 56 while bumping starter. If voltage does not alternate between about zero and 5 volts, go to next step. If voltage alternates as specified, CKP circuit is okay. Return to QUICK TESTS if sent here from there; otherwise temporarily substitute known good PCM and repeat test to check for improvement.
2) Turn ignition off. Unplug 6-pin distributor connector. Turn ignition on. Measure voltage on VPWR (Yellow/White) wire at harness connector. If voltage is greater than 10 volts, go to next step. If voltage is not greater than 10 volts, repair VPWR wire to distributor.
3) Turn ignition off. Measure resistance between GND (Black/Lt. Green) wire at harness connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, repair Black/Lt. Green wire to ground.
4) Turn ignition off. Install BOB, leaving PCM disconnected. Measure resistance between BOB test pin 56 and CKP wire (Green/Black) at harness connector. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, repair Green/Black wire.
5) Turn ignition off. Install BOB, leaving PCM disconnected. Measure resistance between BOB test pin 56 and ground. Measure resistance between CKP (Green/Black) wire and each other wire at harness connector. If all measurements are greater than 10,000 ohms, replace distributor. If any measurement is not greater than 10,000 ohms, repair shorted CKP wire.
PINPOINT TEST EVP - EGR VALVE POSITION (EVP) SENSOR
Note. Enter this test only when Code 16 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST.
Identifying EVP Circuit & Connector. Scheme 3
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| EVP | 2J | 6 | YEL |
| SIGRTN | 2D | 46 | YEL/GRN |
| VREF | 2K | 26 | LT GRN/RED |
EVP CIRCUIT PIN IDENTIFICATION
1) Inspect hoses and connections between intake manifold and EGR valve. If all appears okay, go to next step. Repair hoses or connections as necessary.
2) Turn ignition off. Connect vacuum gauge between EGR valve and vacuum hose going to EGR valve. Start engine. Warm engine to normal operating temperature. Observe vacuum gauge while assistant drives vehicle. If gauge indicates about 5 in. Hg at normal cruise, and zero in. Hg at idle, deceleration, and high speed, go to next step. If gauge indicates otherwise, inspect hoses for leaks, damage, or obstructions. If hoses are okay, repair EGR system.
3) Turn ignition off. Install BOB, leaving PCM connected. Connect vacuum tester to EGR valve vacuum port. Turn ignition on. Measure voltage between BOB test pins 6 and 46 while applying vacuum to EGR valve. If voltage does not increase smoothly from approximately 0.8 volt at zero vacuum to approximately 5.0 volts at 5.9 in. Hg., go to next step. If voltage is as specified, EVP circuit is okay. Return to QUICK TESTS if sent here from there; otherwise temporarily substitute known good PCM and retest.
4) Turn ignition off. Unplug EVP connector. Turn ignition on. Measure voltage at VREF terminal (Light Green/Red wire) at EVP harness connector. If voltage is 4.5-5.0 volts, go to next step. If voltage is not as specified, go to PINPOINT TEST VREF.
5) Turn ignition off. Measure resistance between at SIGRTN terminal (Yellow/Green wire) at EVP harness connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is not as specified, repair Yellow/ Green wire.
6) Measure resistance between BOB test pins 6 and 26. If resistance is not greater than 10,000 ohms, repair short between EVP (Yellow) and VREF (Light Green/Red) wires. If resistance is greater than 10,000 ohms, replace EVP sensor.
PINPOINT TEST VSS - VEHICLE SPEED SENSOR
Note. Enter this test only when Code 06 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST.
Identifying VSS Circuit & Connectors. Scheme 4
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| VSS | 1M | 21 | GRN/RED |
VSS CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB. Disconnect speedometer cable at transaxle. Turn ignition on. Measure voltage at BOB test pin 21 while rotating speedometer cable. If voltage does not cycle between zero and 5 volts, go to next step. If voltage cycles as specified, VSS circuit is okay; return to diagnostic routine.
2) Turn ignition off. Unplug PCM connectors. Unplug 14-pin instrument cluster connector. Measure resistance of VSS wire (Green/Red) wire between BOB test pin 21 and instrument cluster harness connector. If resistance is less than 5 ohms, go to next step. If resistance is not as specified, repair open VSS wire.
3) Measure resistance of VSS wire (Green/Red) wire between BOB test pin 21 and ground. If resistance is not greater than 10,000 ohms, repair shorted VSS wire. If resistance is as specified, measure voltage at BOB test pin 21. If voltage is not zero, service VSS.
PINPOINT TEST MAF - MASS AIRFLOW METER
Note. Enter this test only when Code 08 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST.
Identifying MAF Circuit & Connectors. Scheme 5
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| MAF | 2Q | 27 | GRN/BLK |
| SIGRTN | 2C | 16 | BLK/LT GRN |
| VPWR | 1B | 37, 57 | YEL/WHT |
MAF CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Connect BOB. Reconnect PCM. Turn ignition on. Measure voltage between BOB test pins 27 and 16, first with engine off, then with engine running. If voltage is not 1.0-1.5 volts with engine off, and 1.5-5.0 volts with engine running, go to next step. If voltage is as specified, MAF circuit is okay. Return to QUICK TESTS if sent here from there; otherwise temporarily substitute known good PCM and retest.
2) Turn ignition off. Unplug PCM connectors. Unplug MAF sensor connector, located between air cleaner and throttle body. Measure resistance between BOB test pin 27 and MAF terminal (Green/Black wire) on harness connector. If resistance is less than 5 ohms, go to next step. If resistance is not as specified, repair open Green/Black wire.
3) Measure resistance between BOB test pin 27 and ground. Measure resistance between BOB test pin 27 and BOB test pins 37 and 57. If both measurements are greater than 10,000 ohms, go to next step. If either measurement is not as specified, repair shorted MAF (Green/Black) wire.
4) Turn ignition on. Check for battery voltage at VPWR terminal (Yellow/White wire) at MAF harness connector. If battery voltage exists, go to next step. If battery voltage does not exist, go to PINPOINT TEST VPWR. If VPWR is okay, repair shorted Yellow/White wire.
5) Turn ignition off. Measure resistance between MAF harness connector SIGRTN terminal (Black/Light Green wire) and ground. If resistance is less than 5 ohms, replace MAF sensor. If resistance is not less than 5 ohms, repair Black/Light Green wire.
PINPOINT TEST ECT - ENGINE COOLANT TEMPERATURE SENSOR
Note. Enter this test only when a Code 09 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST. To prevent unnecessary diagnosis, inspect coolant level, oil level, cooling fan, thermostat, and airflow to radiator before testing.
Identifying ECT Sensor Circuits. Scheme 6
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| ECT | 2H | 51 | RED/BLU |
| SIGRTN | 2D | 46 | YEL/GRN |
ECT CIRCUIT PIN IDENTIFICATION
1) Start and run engine until coolant temperature reaches 176°F (80°C). Turn ignition off. Install BOB. Leave PCM disconnected. Measure resistance between BOB test pins 51 and 46. If resistance is not 250-350 ohms, go to next step. If resistance is as specified, ECT circuit is okay.
2) Unplug ECT sensor, threaded into intake manifold. Inspect ECT wire (Red/Blue) between ECT and PCM for shorts or opens. If wire is okay, go to next step. Repair ECT wire as necessary.
3) Inspect SIGRTN wire (Yellow/Green) between ECT and PCM for opens. Repair SIGRTN wire as necessary. If wire is okay, replace ECT sensor.
PINPOINT TEST IAT - INTAKE AIR TEMPERATURE SENSOR
Note. Enter this test only when a Code 10 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST.
Identifying IAT Circuits. Scheme 7
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| IAT | 2L | 27 | GRN/RED |
| SIGRTN | 2D | 46 | YEL/GRN |
IAT CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB, leaving PCM disconnected. Measure ambient temperature at IAT, located in air cleaner. Measure resistance between IAT and SIGRTN test pins. Compare resistance to specifications in IAT SENSOR RESISTANCE table. If resistance is not within specification, go to next step. If resistance is within specification, IAT circuit is okay.
| Temperature °F (°C) | Ohms |
|---|---|
| 32 (0) | 72,100-79,400 |
| 55 (13) | 54,300-58,600 |
| 77 (25) | 29,700-36,300 |
| 110 (43) | 17,900-19,300 |
| 185 (85) | 3300-3700 |
IAT SENSOR RESISTANCE
2) Unplug IAT connector. Inspect IAT wire for continuity between IAT wire at connector and BOB test pin 27. If resistance is less than 5 ohms, go to next step. Repair wire as necessary.
3) Inspect IAT wire for shorts to ground. If resistance to ground is not less than 10,000 ohms, go to next step. Repair wire as necessary.
4) Inspect SIGRTN wire for continuity between SIGRTN wire at connector and BOB test pin 46. If resistance is less than 5 ohms, replace IAT. Repair wire as necessary.
PINPOINT TEST TP - THROTTLE POSITION SENSOR
Note. Enter this test only when a Code 12 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST.
Identifying TP Circuits. Scheme 8
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| TP | 2M | 47 | LT GRN/WHT |
| SIGRTN | 2D | 46 | YEL/GRN |
| VREF | 2K | 26 | LT GRN/RED |
TP CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB. Reconnect PCM. Turn ignition on. Measure voltage at BOB test pin 47 while opening throttle. Compare voltage to specification in TP SENSOR OUTPUT VOLTAGE table. If output voltage is not within specification, go to next step.
| Throttle Opening | (1) Voltage |
|---|---|
| 1/4 | 0.5 |
| 1/2 | 2.75 |
| 3/4 | 3.88 |
| Full Open | 5.0 |
| (1) Voltage may differ by 15 percent. | |
| (1) | Voltage may differ by 15 percent. |
TP SENSOR OUTPUT VOLTAGE
2) Turn ignition off. Unplug TP sensor connector at throttle body. Turn ignition on. Measure voltage on VREF wire at TP harness connector. If voltage is between 4.5-5.5 volts, go to next step. If voltage is not 4.5-5.5 as specified, go to PINPOINT TEST VREF.
3) Turn ignition off. Install BOB, leaving PCM disconnected. Inspect TP wire for continuity or shorts to ground. If wire is okay, replace TP sensor. Repair wire as necessary.
PINPOINT TEST BARO - BAROMETRIC PRESSURE SENSOR
Note. Enter this procedure only when a Code 14 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST. To prevent unnecessary replacement of components, note following non-EEC items may be at fault: unusually high or low atmospheric pressure, blocked vacuum lines, or basic mechanical engine components.
BARO sensor is incorporated into PCM; it cannot be checked or serviced separately. If Code 14 is set and cannot be cleared, replace PCM.
PINPOINT TEST O2S - OXYGEN SENSOR
Note. Enter this test only when a Code 15 (lean) or Code 17 (rich) is displayed during QUICK TESTS procedure.
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| O2S | 2N | 29 | WHT |
O2S CIRCUIT PIN IDENTIFICATION
1) Warm engine to operating temperature, and let idle. Unplug O2S. Measure voltage between O2S connector (sensor side) and ground. With engine at idle, voltage should fluctuate between 0.2-0.8 volt.
2) Increase and decrease engine speed while reading voltmeter. When engine speed is decreasing, voltage should decrease. When engine speed is increasing, voltage should increase. If voltage is within specification, go to next step. If voltage is not within specification, replace O2S.
3) With ignition off, install BOB. Leave PCM disconnected. Unplug O2S connector. Measure resistance between O2S test pin and O2S connector wire. If resistance is less than 5 ohms, O2S circuit is okay. Return to QUICK TESTS if sent here from there. If not sent here from QUICK TESTS, replace PCM. If resistance is not as specified, repair O2S wire to PCM.
PINPOINT TEST SCG - SOLENOID CONTROLLED BY GROUND
Note. Enter this test only when a Code 25, 26, 28 or 29 is displayed during QUICK TESTS procedure or when directed here from another PINPOINT TEST.
Identifying SCG Circuits & Connectors - 1 Of 2. Scheme 9
Identifying SCG Circuits & Connectors - 2 Of 2. Scheme 10
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| CANP | 2X | 31 | RED/BLU |
| INJ1 | 2U | 58 | GRN/YEL |
| INJ2 | 2V | 59 | GRN/BLK |
| INJ3 | 2Y | 33 | GRN/RED |
| INJ4 | 2Z | 8 | GRN/BLU |
| IAC | 2W | 41 | RED/WHT |
| EGRV | 2R | 13 | BLU |
| EGRC | 2S | 53 | RED/YEL |
SCG CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Connect BOB. Leave PCM disconnected. Turn ignition on. Ground appropriate BOB test pin. If solenoid does not operate properly, go to next step. Return to QUICK TESTS if sent here from there. Solenoid is okay if it functions properly.
2) Turn ignition off. Unplug suspect solenoid connector. Turn ignition on. Measure voltage between VPWR wire on harness connector and ground. If voltage is higher than 10 volts, go to next step. If voltage is not as specified, go to PINPOINT TEST VPWR.
3) Inspect wire to solenoid for shorts or open circuit. Repair wire as necessary. If wire is okay, replace solenoid.
PINPOINT TEST PGC - POWER & GROUND CONNECTIONS
Note. Enter this test only when directed here from QUICK TESTS or another PINPOINT TEST.
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| GND | 2A | 39, 40, 44, 60 | BLK/ORG |
| GND | 2B | 20 | BLK/ORG |
| GND | 2C | 16 | BLK/LT GRN |
| KAPWR | 1A | 1 | (1) BLU/RED |
| MT/AT (2) | 1G | 36 | (3) BLK |
| (1) Battery voltage. (2) Manual transmission only. (3) Ground. | |||
| (1) | Battery voltage. |
| (2) | Manual transmission only. |
| (3) | Ground. |
PGC CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB, leaving PCM disconnected. Turn ignition on. Measure voltage at BOB pin in question. Compare voltage to specification in PGC CIRCUIT PIN IDENTIFICATION table. If voltage is to specification, go to next step. If voltage is not to specification, repair wire in question.
2) Measure resistance between ground and BOB pin in question. If any measurement is greater than 5 ohms, repair associated wire to ground. If resistance is not greater than 5 ohms, return to PINPOINT TEST VREF if sent here from there, and temporarily substitute known good PCM. If not sent here from PINPOINT TEST VREF, return to diagnostic routine.
PINPOINT TEST STI - SELF-TEST INPUT
Note. Enter this test only when sent here from RETRIEVING CODES under SELF-DIAGNOSTIC SYSTEM.
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| STI | 1K | 48 | BLU |
STI CIRCUIT PIN IDENTIFICATION
Turn ignition off. Install BOB, leaving PCM disconnected. Inspect STI wire for shorts or opens. Repair as necessary. If STI wire is okay, go to PINPOINT TEST STO.
PINPOINT TEST STO - SELF-TEST OUTPUT
Note. Enter this test only when codes cannot be retrieved or when directed by PINPOINT TEST STI.
Identifying STO Circuit & Connector. Scheme 11
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| STO | 1F | 17 | WHT/BLK |
STO CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB, leaving PCM disconnected. Measure resistance between STO test pin and STO terminal of DLC. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair circuit between PCM and self-test connector.
2) Measure resistance between STO test pin and ground. If resistance is less than 10,000 ohms, repair shorted STO wire. Turn ignition on. Measure voltage between STO test pin and ground. If voltage is not zero, go to PINPOINT TEST PGC.
PINPOINT TEST MIL - MALFUNCTION INDICATOR LIGHT
Note. Enter this test only when directed here from QUICK TESTS.
| Switch | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| MIL | 1E | 15 | BLU |
MIL CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB, leaving PCM disconnected. Turn ignition on. Ground BOB test pin 15. If MIL light comes on, MIL circuit is okay. If codes do not flash on MIL during QUICK TEST or MIL never comes on, temporarily substitute known good PCM and retest. If MIL light stays off, go to next step.
2) Turn ignition off. Remove instrument panel 14-pin connector. Remove and inspect bulb. If bulb is okay, go to next step. If necessary, replace bulb.
3) Turn ignition off. Inspect for shorts or grounds in MIL wire between instrument panel connector and BOB test pin. If any defects exist, repair wire. If wire is okay, replace the instrument panel printed circuit board.
PINPOINT TEST ROC - RELAY OUTPUT CHECK
Note. Enter this test only when directed here from WIGGLE TEST under QUICK TESTS.
| Switch | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| ACR | 1J | 54 | BLU/ORG |
| FPR | 1H | 55 | WHT/YEL |
| CFAN | 2P | 45 | LT GRN |
WAC CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB, leaving PCM connected. Turn ignition on. Ground appropriate test pin at BOB. Listen for clicking from suspect relay. If relay does not click, go to next step. If relay clicks, ROC is okay. If sent here from QUICK TEST, return to WIGGLE TESTS; otherwise temporarily substitute known good PCM and retest.
2) Turn ignition off. Inspect for shorts or grounds in wire between appropriate relay connector and BOB test pin. Repair wire as necessary. If no problems are found, go to next step.
3) Turn ignition off. Disconnect suspect relay. Turn ignition on. Measure voltage at power terminal of relay connector. If voltage is more than 10 volts, replace relay. If voltage is less than 10 volts, repair power wire.
PINPOINT TEST STG - SWITCH TO GROUND
Note. Enter this test only when directed here from QUICK TESTS or another PINPOINT TEST.
| Switch | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| PSP | 1P | 19 | BLU/YEL |
| PCS | 1Q | 10 | GRN/WHT |
| HPS (1) | 2I | 50 | BLU |
| BLMT | 1R | 22 | ORG/BLU |
| PNP/CPP | 1V | 43 | GRN/BLK |
| IDL | 1N | 18 | RED |
| (1) Output voltage should always be 5 volts regardless of switch position. | |||
| (1) | Output voltage should always be 5 volts regardless of switch position. |
STG CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB, leaving PCM connected. Turn ignition on. Measure voltage between BOB test pin for switch in question and ground. Exercise switch. With switch open, voltage should be greater than 10 volts. With switch closed, voltage should be zero. If switch output is not as specified, go to next step. If switch output is as specified, switch is okay.
2) Turn ignition off. Unplug PCM connectors. Unplug switch in question. Inspect wire between switch and BOB for shorts or open circuits. If wire is okay, go to next step. Repair wire as necessary.
3) Inspect for open circuit in wire between switch in question and ground. Repair wire as necessary. If wire is okay, replace switch.
PINPOINT TEST STP - SWITCH TO POWER
Note. Enter this test only when directed here from QUICK TESTS.
| Switch | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| BOO | 1O | (1) 2 | GRN |
| DEF | 1L | (1) 42 | BLK/RED |
| HDLP | 1U | (1) 28 | RED/GRN |
| VST | 1C | (2) 25 | BLK/WHT |
| (1) Battery voltage with switch closed. (2) Approximately 9 volts while cranking engine. | |||
| (1) | Battery voltage with switch closed. |
| (2) | Approximately 9 volts while cranking engine. |
STP CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB, leaving PCM disconnected. Turn ignition on. Cycle switch in question. Measure voltage between appropriate BOB test pin and ground. If voltage is not as specified, go to next step. If voltage is approximately as specified, switch is okay. If sent here from SWITCH MONITOR TEST in QUICK TESTS, temporarily substitute known good PCM and retest. If sent here from elsewhere in QUICK TESTS, return to QUICK TESTS.
2) Turn ignition off. Unplug switch connector. Turn ignition on. Check for battery voltage at harness connector PWR wire for the switch in question. If battery voltage exists, go to next step. If battery voltage does not exist, repair open PWR wire to switch.
3) Measure resistance between switch terminals. Operate switch. If resistance is less than 5 ohms with switch closed and greater than 10,000 ohms with switch open, switch is okay. If sent here from SWITCH MONITOR TEST in QUICK TESTS, return to QUICK TESTS. If resistance is not as specified, replace switch.
PINPOINT TEST VPWR - VEHICLE POWER
Note. Enter this test only when directed here from another PINPOINT TEST. To prevent replacement of good components, note following non-EEC components may be faulty: ignition switch, alternator, battery cables, ground straps, or voltage regulator. This test is intended to diagnose only PCM, wiring harness circuits, and battery voltage.
Identifying VPWR Circuit & Connector. Scheme 12
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| GND | 2A | 39, 40, 44, 60 | BLK/ORG |
| GND | 2B | 20 | BLK/ORG |
| GND | 2C | 16 | BLK/LT GRN |
| VPWR | 1B | 37, 57 | YEL/WHT |
VPWR CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB, leaving PCM disconnected. Turn ignition on. Measure voltage between BOB test pins 37 and 57 and battery ground. If voltage is greater than 10 volts, go to next step. If voltage is not greater than 10 volts, go to step 3).
2) Turn ignition off. Measure resistance of each wire between BOB GND test pins and ground. Repair any wire with resistance not less than 5 ohms. If resistance is less than 5 ohms for each wire, VPWR circuit is okay. Return to the PINPOINT TEST that sent you here.
3) Turn ignition off. Remove main relay. Main relay is located behind instrument panel, on left side. Measure resistance between BOB test pin 37 and 57 and main relay harness connector. If resistance is less than 5 ohms, go to next step. Repair VPWR wire if resistance is not less than 5 ohms.
4) Inspect GND wire for continuity between main relay harness connector and ground. If wire is okay, go to next step. Repair wire as necessary.
5) Measure voltage between main relay harness connector BATT wire and ground. If voltage is greater than 10 volts, go to next step. If voltage is not greater than 10 volts, repair BATT wire from battery to harness connector.
6) Measure voltage between harness connector PWR wire and ground. If voltage is not greater than 10 volts, repair PWR wire from ignition switch to harness connector. If voltage is greater than 10 volts, replace main relay.
PINPOINT TEST VREF - REFERENCE VOLTAGE & SIGNAL RETURN
Note. Enter this test only when directed from another PINPOINT TEST.
Identifying VREF Circuit & Connector. Scheme 13
| Circuit | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| SIGRTN | 2D | 46, 49 | YEL/GRN |
| VREF | 2K | 26 | LT GRN/RED |
VREF CIRCUIT PIN IDENTIFICATION
1) Turn ignition off. Install BOB, leaving PCM connected. Turn ignition on. Measure voltage between BOB test pins 46 and 49. If voltage is 4.5-5.5 volts, go to next step. If voltage is not as specified, go to PINPOINT TEST VPWR. If VPWR is okay, temporarily substitute known good PCM and retest.
2) Turn ignition off. Unplug ECT, EVP and IAT connectors. Turn ignition on. Measure voltage at VREF terminal at each connector. If voltage is zero volts, go to next step. If voltage is 4.5-5.5 volts, VREF circuit is okay; return to QUICK TESTS. If battery voltage exists, repair short to voltage.
3) Turn ignition off. Disconnect PCM. Measure resistance between VREF terminal at each sensor harness connector and appropriate BOB test pin. If resistance of each wire is less than 5 ohms, go to next step. Repair any wire as necessary.
4) Measure resistance between BOB test pin 26 and ground. If resistance is not greater than 10,000 ohm, repair VREF wire.