COMMENTS

COMMENTS Mitsubishi Lancer Evolution VIII

Failure may occur on vehicle speed signal circuit, speedometer and PCM.

Malfunction of the output shaft speed sensor
Malfunction of the speedometer
Damaged harness or connector
Malfunction of the PCM

Required Special Tool

MB991958: Scan Tool (MUT-III Sub Assembly)
MB991824: V.C.I.
MB991827: MUT-III USB Cable
MB991911: MUT-III Main Harness B

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STEP 1. Using scan tool MB991958, read the A/T diagnostic trouble code. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position Check for A/T diagnostic trouble code. Turn the ignition switch to the "LOCK" (OFF) position. Q: Is DTC 23 set? YES : Refer to «DTC 23 (P0720): OUTPUT SHAFT SPEED SENSOR SYSTEM»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/automatic-trans/#diagnosis-sportback) . NO: Go to Step 2.
STEP 2. Using scan tool MB991958, check data list item 29: Vehicle Speed Signal. Connect scan tool MB991958 to the data link connector. Start the engine. Set scan tool MB991958 to data reading mode. Item 29: Vehicle Speed Signal. Check that the speedometer and scan tool MB991958 display speed match when driving at a vehicle speed of 40 km/h (25 mph). Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the sensor operating properly? YES : It can be assumed that this malfunction is intermittent. Refer to «HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS»(ref-215473-S08378565702006011200000) - How to Cope with Intermittent Malfunction. NO : Go to Step 3.
STEP 3. Using an oscilloscope, check the vehicle speed signal waveform at PCM connector C-112 by backprobing. Do not disconnect connector C-112. Connect an oscilloscope probe to PCM connector C-112 terminal 79 by backprobing. Start the engine and drive the vehicle. Check the vehicle speed signal waveform. The vehicle speed signal waveform should show a pattern similar to the illustration. The maximum value should be 11 volts and more and the minimum value 0.6 volt and less. The output waveform should not contain electrical noise Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the waveform normal? YES : Go to Step 4. NO : Go to Step 5 .
STEP 4. Check PCM connector C-112 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are the connector and terminals in good condition? YES: Go to Step 8 . NO: Repair or replace the damaged components. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/oem-general-information/#general-sportback) .
STEP 5. Check combination meter connector C-02, joint connector C-03, intermediate connector C-118 and PCM connector C-112 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are the connectors and terminals in good condition? YES: Go to Step 6. NO: Repair or replace the damaged components. Refer to «HARNESS CONNECTOR INSPECTION»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/oem-general-information/#general-sportback) .
STEP 6. Check the harness for open circuit, short circuit to ground or damage between combination meter connector C-02 terminal 12 and PCM connector C-112 terminal 79. Q: Is the harness wire in good condition? YES: Go to Step 7. NO: Repair or replace the harness wire.
STEP 7. Check the speedometer. Refer to «INSPECTION PROCEDURE 1: SPEEDOMETER DOES NOT WORK»(/mitsubishi/lancer-evolution/viii-2003-2005/remont/gauges-instrument-panels/#combination-meter-assembly-sportback) . Q: Is the speedometer operating properly? YES: Go to Step 8. NO: Replace the combination meter.
STEP 8. Using scan tool MB991958, check data list item 29: Vehicle Speed Signal. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958 to the data link connector. Start the engine. Set scan tool MB991958 to data reading mode. Item 29: Vehicle Speed Signal. Check that the speedometer and scan tool MB991958 display speed match when driving at a vehicle speed of 40 km/h (25 mph). Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the sensor operating properly? YES : It can be assumed that this malfunction is intermittent. Refer to «HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS»(ref-215473-S08378565702006011200000) - How to Cope with Intermittent Malfunction. NO : Replace the PCM.