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
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