Mitsubishi Lancer Evolution 8 MR. Manual - part 16

MANUAL TRANSMISSION  - TROUBLESHOOTING

22-2

2. Check procedures by diagnosis code

Remarks
In cases where other diagnosis codes are output, please refer to the relevant item.

Code No.12 Power supply voltage (valve power supply) system

Assumed cause of concern

If the 4WD-ECU power supply voltage drops below 9V or rises
above 18V, Code No.12 is output, indicating either a broken wire in
the power supply circuit, a short, or a drop in the battery voltage.

• battery malfunction 
• harness, connector malfunction 
• 4WD-ECU malfunction

Battery inspection
NG -> replace

MUT-II/III Service data
• No.10 Battery voltage

OK: battery voltage

OK -> Intermittent malfunction

Measurement at C-38 4WD-ECU connector 
• ECU terminal voltage measurement
• Ignition switch: ON
• Voltage 13 – earth

OK: battery voltage

Connector check: C-38
NG -> repair

MUT-II/III Service data
• No.10 battery voltage

OK: battery voltage

NG -> replace 4WD-ECU
OK -> intermittent malfunction

Connector check: C-38, C-133, C212, C-210
NG -> repair

Check harness between ignition switch – 4WD-ECU
• Check to see if power supply wire broken, short, or

damage

NG -> repair

OK

OK

OK

OK

NG

NG

MANUAL TRANSMISSION  - TROUBLESHOOTING

22-3

Vehicle speed sensor fitting check
NG -> repair

MUT-II/III Service Data
• No.01 Vehicle speed sensor <FR>
• No.02 Vehicle speed sensor <FL>
• No.03 Vehicle speed sensor <RR>
• No.04 Vehicle speed sensor <RL>

OK: Speed shown on speedometer and MUT-II/III agree

OK -> Intermittent malfunction

Measurement at C-38 4WD-ECU connector
• Undo connector and take measurement on harness

side

(1) Resistance between 9 – 22 (vehicle speed sensor <FR>)
(2) Resistance between 6 - 19 (vehicle speed sensor <FL>)
(3) Resistance between 7 - 20 (vehicle speed sensor <RR>)
(4) Resistance between 8 – 21 (vehicle speed sensor <RL>)

OK: 1.2 – 1.6 k

Ω

To next page

Vehicle wheel speed sensor check
(Refer to Group 35B – Vehicle wheel speed sensor)

*1

NG -> Replace

Connector checks: C-38, A-05, A-31, D-11, D-05, 
D-12, C-131, C-20, C-115, C-34
NG -> Repair

Harness check between 4WD-ECU – each vehicle
wheel speed sensor
• Check output wire for broken wire, earthing, short
• Check earth wire to see if broken or damaged
NG -> Repair

MUT-II/III Service data
• No.1 Vehicle speed sensor <FR>
• No.2 Vehicle speed sensor <FL>
• No.3 Vehicle speed sensor <RR>
• No.4 Vehicle speed sensor <RL>
OK: Speed shown on speedometer and MUT-II/III agree
NG -> Replace 4WD-ECU
OK -> Intermittent malfunction

Code No.21 Vehicle wheel speed sensor <FR> systems
Code No.22 Vehicle wheel speed sensor <FL> systems
Code No.23 Vehicle wheel speed sensor <RR> systems
Code No.24 Vehicle wheel speed sensor <RL> systems

Assumed cause of concern

When one of the vehicle wheel speed sensors detects a
vehicle speed of 15kph or more, and when even one of the
remaining 3 sensors cannot detect vehicle speed, the
diagnosis code for wheel speed sensor broken wire or short is
output.

• Wheel speed sensor malfunction
• Rotor malfunction
• Wheel bearing malfunction
• Harness, connector malfunction
• 4WD-ECU malfunction

<ACD fitted vehicle>

Remarks

*1

: refer to ’00-5 Lancer Sedia Service Manual (No.1036K00)

*2

: refer to ’01-1 Lancer Evolution VII Service Manual (No.1036K02)

OK

OK

OK

OK

OK

NG

NG

MANUAL TRANSMISSION  - TROUBLESHOOTING

22-4

From previous page

Check vehicle wheel speed sensor output voltage (ref.
p.22-41)

*2

Check connector: C38
NG -> Repair

MUT-II/III Service data
• No.1 Vehicle speed sensor <FR>
• No.2 Vehicle speed sensor <FL>
• No.3 Vehicle speed sensor <RR>
• No.4 Vehicle speed sensor <RL>

OK: Speed shown on speedometer and MUT-II/III
agree

NG -> Replace 4WD-ECU
OK -> Intermittent malfunction

Vehicle speed sensor and rotor check
(Refer to Group 35B – Vehicle wheel speed sensor)

*1

NG -> Repair

Wheel bearing check (Refer to Group 26 – Vehicle
Servicing, Group 27B – Rear Hub Assembly)

*2

NG -> Repair

NG

OK

OK

OK

Vehicle speed sensor fitting check
NG -> repair

MUT-II/III Service Data
• No.01 Vehicle speed sensor <FR>
• No.02 Vehicle speed sensor <FL>
• No.03 Vehicle speed sensor <RR>
• No.04 Vehicle speed sensor <RL>

OK: Speed shown on speedometer and MUT-II/III agree

OK -> Intermittent malfunction

Measurement at C-38 4WD-ECU connector
• Undo connector and take measurement on harness

side

(1) Resistance between 9 – 22 (vehicle speed sensor

<FR>)

(2) Resistance between 6 - 19 (vehicle speed sensor

<FL>)

(3) Resistance between 7 - 20 (vehicle speed sensor

<RR>)

(4) Resistance between 8 – 21 (vehicle speed sensor

<RL>)

OK: 1.2 – 1.6k

Ω

Check vehicle wheel speed sensor output voltage (ref.
p.22-41)

*2

Check connector: C-38
NG -> repair

MUT-II/III Service data
• No.1 Vehicle speed sensor <FR>
• No.2 Vehicle speed sensor <FL>
• No.3 Vehicle speed sensor <RR>
• No.4 Vehicle speed sensor <RL>

OK: Speed shown on speedometer and MUT-II/III
agree

NG -> Replace 4WD-ECU
OK -> Intermittent malfunction

Vehicle wheel speed sensor
(Refer to Group 35B – Vehicle wheel speed sensor)

*1

NG -> Repair

Connector checks: C-38, A-05, A-31, D-11, D-05, 
D-12, C-131, C-20, C-115, C-34
NG: Repair

Harness check between 4WD-ECU – each vehicle
wheel speed sensor
• Check output wire for broken wire, earthing, short
• Check earth wire to see if broken or damaged
NG: repair

MUT-II/III Service data
• No.1 Vehicle speed sensor <FR>
• No.2 Vehicle speed sensor <FL>
• No.3 Vehicle speed sensor <RR>
• No.4 Vehicle speed sensor <RL>

OK: Speed shown on speedometer and MUT-II/III
agree

NG -> Replace 4WD-ECU
OK -> Intermittent malfunction

Vehicle wheel speed sensor and rotor check
(Refer to Group 35B – Vehicle Wheel Speed Sensor)

*1

NG -> Repair

Wheel bearing check (Refer to Group 26 – Vehicle
Servicing, Group 27B – Rear Hub Assembly)

*2

NG -> Repair

MANUAL TRANSMISSION  - TROUBLESHOOTING

22-5

Code No.25 Abnormal tyre diameter

Assumed cause of concern

Abnormal tyre Code No. 25 is output in cases where, when
the steering wheel is in a central position, and vehicle speed
is 20kph or more, there is a discrepancy between one of the
vehicle wheel speed sensors and the average of the 4 wheel
speed sensors, in that it is outside the specified range.
However, the warning lamp does not come on.

• Tyre malfunction
• Vehicle speed sensor malfunction
• Rotor malfunction
• Wheel bearing malfunction
• Harness, connector malfunction
• 4WD-ECU malfunction

<ACD fitted vehicles>
Remarks

*1

: refer to ’00-5 Lancer Sedia Service Manual (No.1036K00)

*2

: refer to ’01-1 Lancer Evolution VII Service Manual (No.1036K02)

OK

OK

OK

OK

NG

NG

OK

NG

OK

OK

OK