Mitsubishi Grandis. Manual — part 350

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-19

Step 3. Check the harness wires between key
reminder switch connector C-308 (terminal 7) and
engine-ECU <M/T> or engine-A/T-ECU <A/T>
connector C-112 (terminal 65).

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-20

NOTE: Prior to the wiring harness inspection, check
intermediate connector C-17, and repair if necessary.

Q: Are the harness wires between key reminder

switch connector C-308 (terminal 7) and
engine-ECU <M/T> or engine-A/T-ECU <A/T>
connector C-112 (terminal 65) in good condition?

YES :

Go to Step 4.

NO :

Repair the wiring harness.

Step 4. Check the communication with MUT-III.

Q: Can the system communicate with the MUT-III?

YES :

Go to Step 5.

NO :

Refer to Inspection procedure 1 "Diagnosis
code No.P0513 is set to the MPI system or
the immobilizer ECU cannot communicate
with the MUT-III"

P.54A-13

.

Step 5. MUT-III diagnosis code

Check whether the engine immobilizer
system-related diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Refer to

P.54A-10

.

NO :

Go to Step 6.

STEP 6. Check the trouble symptom

Check that the ignition key can be registered.

Q: Is the check result normal?

YES :

The procedure is complete.

NO :

Replace the immobilizer ECU, and then go
to Step 7 .

AC310616

AF

Harness side

Connectors: C-17, C-112 <LHD>

C-112 (GR)

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

C-112

C-17

C-17

AC310629AD

Harness side

Connectors: C-17, C-112 <RHD>

C-112 (GR)

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

C-112

C-17

C-17

AC310153AE

Connector: C-308 <LHD>

Harness side

AC310183

AE

Connector: C-308 <RHD>

Harness side

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-21

STEP 7. Check the trouble symptom

Check that the ignition key can be registered.

Q: Is the check result normal?

YES :

The procedure is complete.

NO :

Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

Inspection procedure: 3 The engine does not start. (cranking occurs but initial combustion does not)

COMMENTS ON TROUBLE SYMPTOM

If the fuel injection does not work, the immobilizer
ECU and the MPI system may be defective. It is no
problem with the malfunction above when the engine
is started with unregistered ignition key.

POSSIBLE CAUSES

• Malfunction of MPI system

• Malfunction of immobilizer ECU

DIAGNOSIS PROCEDURE

Step 1. Battery voltage check

Measure the battery voltage when cranking.

OK: 8 V or more

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Check the battery. Refer to

P.54A-6

.

Step 2. MUT-III other systerm diagnosis code

Check whether the MPI system-related diagnosis
code is set.

Q: Is the diagnosis code set?

YES :

Refer to GROUP 13A

− Troubleshooting

P.13A-20

.

NO :

Go to Step 3.

Step 3. MUT-III diagnosis code

Check whether the engine immobilizer
system-related diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Refer to

P.54A-10

.

NO :

Go to Step 4.

Step 4. Check that the engine starts.

Q: Does the engine start?

YES :

The procedure is complete.

NO :

Refer to GROUP 13, Troubleshooting

P.13A-20

. Replace the immobilizer ECU

when the cause of the failure cannot tracked
down by performing the troubleshooting.

Inspection procedure: 4 Check the power supply and earth circuit to the immobilizer ECU.

CIRCUIT OPERATION

Refer to

P.54A-13

.

COMMENTS ON TROUBLE SYMPTOM

The power supply and earth circuit to the immobilizer
ECU may be defective.

POSSIBLE CAUSES

• Damaged harness wires and connectors

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-22

DIAGNOSTIC PROCEDURE

Step 1. Connector check: Key reminder switch
connector C-308

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the defective connector.

Step 2. Voltage measurement at key reminder
switch connector C-308 in order to check the
battery circuit of power supply system to the key
reminder switch.

(1) Disconnect the key reminder switch connector

C-308 and measure the voltage at key reminder
switch connector C-308 harness side.

(2) Turn the ignition switch to “ON” position.

(3) Measure the voltage between terminal 5 and

earth.

OK: Battery voltage

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 3.

AC310153AE

Connector: C-308 <LHD>

Harness side

AC310183

AE

Connector: C-308 <RHD>

Harness side

AC310153AE

Connector: C-308 <LHD>

Harness side

AC310183

AE

Connector: C-308 <RHD>

Harness side

AC310507CT

Connector C-308
(Harness side)