DTC 17: Defective active skid control switch: Diagnosis

WARNING: This page is about a different car, the 2006 Mitsubishi Montero. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B
MB991223: Harness Set

STEP 1. Check active skid control switch connector E-125.
Q: Is active skid control switch connector E-125 in good condition?

YES : Go to Step 2.

NO : Repair or replace the connector.

Fig 1: Identifying Active Skid Control Switch Connector E-125
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 2. Check the active skid control switch continuity.

Remove the active skid control switch (Refer to BRAKE PEDAL ).
Connect an ohmmeter between to active skid control switch connector terminals.

TESTER CONNECTION AND SPECIFIED CONDITION CHART

ACTIVE SKID CONTROL SWITCH CONDITION	TESTER CONNECTION	SPECIFIED CONDITION
ON	3 - 6	Less than 2 ohms
ON	2 - 3, 2 - 6	Open circuit
Neutral	2 - 3, 2 - 6, 3 - 6	Open circuit
OFF	2 - 3	Less than 2 ohms
OFF	2 - 6, 3 - 6	Open circuit

Fig 2: Checking Active Skid Control Switch Continuity

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q:Is the active skid control switch in good condition?

YES : Go to Step 3.

NO : Replace the active skid control switch, and then go to Step 9.

STEP 3. Check the ground to the active skid control switch. Measure the resistance at active skid control switch connector E-125.
1. Disconnect active skid control switch connector E-125, and measure the resistance at the harness-side connector.
  
  Fig 3: Identifying Active Skid Control Switch Connector E-125
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Measure the resistance between active skid control switch connector E-125 terminal 3 and body ground.
  - The resistance should measure 2 ohms or less.
Q: Does the resistance measure 2 ohms or less?

YES : Go to Step 5.

NO : Go to Step 4.

Fig 4: Measuring Resistance Between Active Skid Control Switch Connector E-125 Terminal 3 And Body Ground
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 4. Check the wiring harness between active skid control switch connector E-125 terminal 3 and the body ground.
NOTE: Also check intermediate connector E-06 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector E-06 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION . If the connector has been repaired or replaced, go to STEP 9.

Q:Is the wiring harness between active skid control switch connector E-125 terminal 3 and the body ground in good condition?

YES : Go to Step 9.

NO : Repair the wiring harness, and then go to Step 9.

Fig 5: Identifying Active Skid Control Switch Connectors E-06 And E-125
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 5. Check the wiring harness between M-ASTC-ECU connector E-121 terminal 78 and the body ground.
NOTE: Also check intermediate connector E-06 and E-122 for loose, corroded, or damaged terminals, or terminals pushed back in connectors. If intermediate connector E-06 or E-122 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION . If the connector has been repaired or replaced, go to STEP 9.

Q:Is the wiring harness between M-ASTC-ECU connector E-121 terminal 78 and the body ground in good condition?

YES : Go to Step 6.

NO : Go to Step 7.

Fig 6: Identifying Active Skid Control Switch Connectors E-06, E-121, E-122 And E-125
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 6. Check the wiring harness between active skid control switch connector E-125 terminal 6 and M-ASTC-ECU connector E-121 terminal 78.
NOTE: Also check intermediate connector E-06 and E-122 for loose, corroded, or damaged terminals, or terminals pushed back in connectors. If intermediate connector E-06 or E-122 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION . If the connector has been repaired or replaced, go to STEP 9.

Q:Is the wiring harness between active skid control switch connector E-125 terminal 6 and M-ASTC-ECU connector E-121 terminal 78 in good condition?

YES : Go to Step 7.

NO : Repair the wiring harness, and then go to Step 9.

Fig 7: Identifying Active Skid Control Switch Connectors E-06, E-121, E-122 And E-125
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 7. Check the wiring harness between M-ASTC-ECU connector E-121 terminal 85 and the body ground.
NOTE: Also check intermediate connector E-06 and E-122 for loose, corroded, or damaged terminals, or terminals pushed back in connectors. If intermediate connector E-06 or E-122 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION . If the connector has been repaired or replaced, go to STEP 9.

Q:Is the wiring harness between M-ASTC-ECU connector E-121 terminal 85 and the body ground in good condition?

YES : Go to Step 9.

NO : Go to Step 8.

Fig 8: Identifying Active Skid Control Switch Connectors E-06, E-121, E-122 And E-125
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 8. Check the wiring harness between active skid control switch connector E-125 terminal 2 and M-ASTC-ECU connector E-121 terminal 85.
NOTE: Also check intermediate connector E-06 and E-122 for loose, corroded, or damaged terminals, or terminals pushed back in connectors. If intermediate connector E-06 or E-122 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION . If the connector has been repaired or replaced, go to STEP 9.

Q:Is the wiring harness between active skid control switch connector E-125 terminal 2 and M-ASTC-ECU connector E-121 terminal 85 in good condition?

YES : Replace the M-ASTC-ECU, and then go to Step 9.

NO : Repair the wiring harness, and then go to Step 9.

Fig 9: Identifying Active Skid Control Switch Connectors E-06, E-121, E-122 And E-125
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 9. Recheck for diagnostic trouble code.
Q:Does DTC 17 reset?

YES : Return to Step 1.

NO : The procedure is complete.