Test Readings, Control Module Connections: Remember
- Note the test readings, use common sense when assessing the results of the tests.
- The specified values are with the ignition in the ON position unless otherwise stated.
- First, make sure the control module is supplied with power and grounded.
- Then, check all the sensor inputs and signals from other systems.
- Finally, check the control module outputs. Remember that the test readings do not indicate whether the actuator is working.
- If any of the test readings are incorrect, use the wiring diagram to determine which lead, connector or component should be checked further.
- The specified test values apply for a Fluke 88/97.
- The test readings % (+) and ms (+) signify the pulse ratio and pulse length of the signal respectively. A test instrument capable of measuring pulse ratio and pulse width must be used. The sign indicates a positive trigger pulse, TRIG+.
> = greater than; < = less than; ~= alternating current
Pins without further comments have no connection. (LP: LOGIC PROBE P = select pulse; p = visible pulses).
Refer to SYSTEM WIRING DIAGRAMS for more information
TEST READING
| Pin | Component/function | In/Out | Test conditions | Across | Test reading |
|---|---|---|---|---|---|
| 1 | Main relay, 87 | In | B+ to 1 | <0.5 V | |
| 2 | Oxygen sensor 2, pre-heating | Out | Idling Coolant temperature above 50° C | 2-25 | approx. 0.3 V |
| 3 | Not connected | ||||
| 4 | Relay. A/C compressor | Out | Idle A/C on |
4-25 | <0.5 V |
| 5 | Cruise B | In | 5-25 | 0 V | |
| Position ON/OFF | B+ | ||||
| 6 | Combustion cyl. 3+4 | In | Idle | 6-25 | 15-90 Hz (LP LO HIp) |
| 7 | Trigger 1 | Out | Idle | 7-25 | 7 Hz 14 ms (-) (LP HI LOp) |
| 8 | Trigger 4 | Out | Idle | 8-25 | 7 Hz 14 ms (-) (LP HI LOp) |
| 9 | Pedal position sensor 2 | In | Pedal released | Use diagnostic tool | 0.355 - 1.010 V |
| Pedal fully depressed | 3.945-4.600 V | ||||
| 10 | Throttle position sensor 2 | In | Throttle closed | 10-70 | 3.910- 4.935 V |
| Throttle fully open | 0.025-1.070 V | ||||
| 11 | Manifold absolute pressure sensor | In | 11-22 | 2.1 V at 100 kPa | |
| 12 | Not connected | ||||
| 13 | Charge air control valve | Out | 13-25 | 32 Hz 2 % (-) 0.5 ms (-) (LP HI LOp) |
|
| 14 | Not connected | ||||
| 15 | Intake air temperature | In | 15-22 | Approx. 2.4 V at 20°C | |
| 16 | Not connected | ||||
| 17 | Crankshaft position sensor | In | Idle Starter motor cranking |
17-18 | 5-15 V~ approx. 800 Hz LP HI LO >2.0V~ |
| 18 | Crankshaft position sensor | In | Idle Starter motor cranking |
17-18 | 5-10 V~ approx. 800 Hz LP HI LO >2.0V~ |
| 19 | P-bus - | In/Out | 19-25 | 2-3 V (LP PHI LO) |
|
| 20 | Not connected | ||||
| 21 | Not connected | ||||
| 22 | Sensor ground | Out | 22-25 | < 0.1 V | |
| 23 | +30 | In | B+ to 23 | < 0.5 | |
| 24 | Throttle motor - | Out | 48-24 | 600 Hz LP HI LO |
|
| 25 | Power ground | In | 25- B- | < 0.1 V | |
| 26 | Main relay | Out | 26-25 | <0.5 V | |
| 10 s after ignition off | B+ | ||||
| 27 | EVAP canister purge valve | Out | Idling, warm engine and valve active | 27-25 | 16 Hz (LP HI LOp) |
| 28 | Not connected | ||||
| 29 | Pedal switch, brake/clutch | In | Automatic position D | 29-25 | B+ |
| Brake or clutch pedal depressed | 0 V | ||||
| 30 | Cruise C | In | 30-25 | 0 V | |
| Position ON/OFF | B+ | ||||
| 31 | Not connected | ||||
| 32 | Not connected | ||||
| 33 | Throttle position sensor 1 | In | Throttle closed | 33-70 | 0.065-1.090 V |
| Throttle fully open | 3.930-4.775 V | ||||
| 34 | Oxygen sensor 1 | In | Idling, warm engine, closed loop active | 34-58 | 0-1 V |
| 35 | Charge air absolute pressure sensor | In | 35-70 | 2.1 V (100 kPa) | |
| 36 | Relay, limp-home solenoid | Out | 36-25 | B+ | |
| 37 | EVAP shut-off valve (certain markets only) | Out | 37-25 | B+ | |
| Activate ON | <0.5 V | ||||
| 38 | Knock signal | In | 38-25 | 2.5 V | |
| 39 | Coolant temperature sensor | In | 39-22 | 1.0 V (90°C) | |
| 40 | Not connected | ||||
| 41 | Not connected | ||||
| 42 | Not connected | ||||
| 43 | +15 | In | 43-25 | B+ | |
| Ignition OFF | <0.5 V | ||||
| 44 | Injector 2 | Out | Idle | 44-25 | 7 Hz 2.5-4.5 ms (-) (LP HI LOp) |
| 45 | Injector 1 | Out | Idle | 45-25 | 7 Hz 2.5-4.5 ms (-) (LP HI LOp) |
| 46 | 5 V | Out | 46-70 | 5 V | |
| 47 | Power ground | In | 47-B- | < 0.1 V | |
| 48 | Throttle motor + | Out | 48-24 | 600 Hz LP HI LO |
|
| 49 | Oxygen sensor 1, pre-heating | Out | Idle | 49-25 | approx. 0.3 V |
| 50 | Fuel pump relay | Out | 50-25 | B+ | |
| Starter motor cranking | <0.5 V | ||||
| 51 | Control valve, bypass | Out | Rev up engine and release accelerator pedal Acceleration under load |
51-25 | B+ <0.5 V |
| 52 | Cruise A | In | 52-25 | 0 V | |
| Position ON/OFF | B+ | ||||
| 53 | Combustion cyl. 1+2 | In | Idle | 53-25 | 15-90 Hz (LP LO HIp) |
| 54 | Trigger 2 | Out | Idle | 54-25 | 7 Hz 14 ms (-) (LP HI LOp) |
| 55 | Trigger 3 | Out | Idle | 55-25 | 7 Hz 14 ms (-) (LP HI LOp) |
| 56 | Pedal position sensor 1 | In | Pedal released Pedal fully depressed |
56-70 | 3.990- 4.645 V 0.400-1.055 V |
| 57 | Oxygen sensor 2 | In | Idling, warm engine, closed loop active | 57-58 | 0-1 V |
| 58 | Reference ground, oxygen sensor | In | 58-25 | < 0.1 V | |
| 59 | EVAP tank pressure valve (certain markets only) | In | Filler cap released and fuel level below sensor | 59-22 | 2.5 V |
| 60 | Not connected | ||||
| 61 | Not connected | ||||
| 62 | Not connected | 62-B- | < 0.1 V | ||
| 63 | Brake lights (not cars with ESP) | In | 63-25 | 0 V | |
| Brake pedal depressed | B+ | ||||
| 64 | Vehicle speed (not cars with ESP) | In | Rotate front left wheel 1/2 rps | 64-25 | 15 Hz 50 % (LP HIp LOp) |
| 65 | Mass air flow sensor | In | Idling, Engine warm, A/C off, electric consumers turned off | 65-25 | Approx. 2.1 kHz |
| 66 | P-bus + | In/Out | 66-25 | 2-3 V (LP PHI LO) |
|
| 67 | Injector 3 | Out | Idle | 67-25 | 7 Hz 2.5-4.5 ms (-) (LP HI LOp) |
| 68 | Injector 4 | Out | Idle | 68-25 | 7 Hz 2.5-4.5 ms (-) (LP HI LOp) |
| 69 | 5 V | Out | 69-22 | 5 V | |
| 70 | Sensor ground | Out | 70-25 | < 0.1 V |