Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 678

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-39

STEP 3. Check for DTC.

Q: Is any of DTC 71, 72, 75 or 76 output?

YES : Replace the SRS-ECU. Refer to

P.52B-66

.

NO : This diagnosis is compleate.(If no malfunctions are

not found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How to

Cope with Intermittent Malfunction

P.00-6

.)

DTC 79: Left hand side-air bag module (squib) system fault 5 for power supply circuit
DTC 93: Left hand side-air bag module (squib) system fault 6 for communication system

AC003886AB

Side Impact Sensor (LH) Circuit

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-40

CIRCUIT OPERATION

•

The SRS-ECU judges how severe a collision is
by detecting signals from the left and right side
impact sensors and the analog G-sensor. If the
impact is over a predetermined level, the SRS-
ECU outputs an ignition signal. At this time, if the
safing G-sensor is on, the SRS air bag will inflate.

DTC SET CONDITIONS

•

These DTC are output if communication between
the side impact sensor (LH) and the SRS-ECU is
not possible or communication is faulty.

TROUBLESHOOTING HINTS

•

Damaged wiring harnesses or connectors

•

Malfunction of the side impact sensor (LH)

•

Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tool:

•

MB991502: Scan Tool (MUT-II)

STEP 1. Check the side impact sensor
(1) Replace the side impact sensor (LH) with the side impact

sensor (RH).

(2) Connect the negative battery terminal.
(3) Erase DTC memory.

Q: Is DTC 79 or 93 erased or DTC 89 or 96 output?

YES : Replace the side impact sensor (LH) with a new one.

Refer to

P.52B-76

. Then go to Step 3.

NO : Go to Step 2.

AC000358AF

CONNECTOR: C-74

SRS-ECU

ACCELERATOR PEDAL

CENTER REINFORCEMENT (LH)

AC003136AB

CONNECTOR: D-12

<ECLIPSE>

<ECLIPSE SPYDER>

FRONT
SEAT BELT

FRONT OF
VEHICLE

REAR
SPEAKER

FRONT
SEAT BELT

FRONT OF
VEHICLE

REAR SPEAKER
BRACKET

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-41

STEP 2. Check the harness wires between SRS-ECU
connector C-74 and side impact sensor (LH) connector D-
12.
Q: Are the harness wires between SRS-ECU connector C-

74 and side impact sensor (LH) connector D-12 in good
condition?
YES : Go to Step 3.
NO : Repair them. Then go to Step 3.

STEP 3. Check for DTC.

Q: Is any of DTC 79 or 93 output?

YES : Replace the SRS-ECU. Refer to

P.52B-66

.

NO : This diagnosis is compleate.(If no malfunctions are

not found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How to

Cope with Intermittent Malfunction

P.00-6

.)

AC000358AF

CONNECTOR: C-74

SRS-ECU

ACCELERATOR PEDAL

CENTER REINFORCEMENT (LH)

AC003136AB

CONNECTOR: D-12

<ECLIPSE>

<ECLIPSE SPYDER>

FRONT
SEAT BELT

FRONT OF
VEHICLE

REAR
SPEAKER

FRONT
SEAT BELT

FRONT OF
VEHICLE

REAR SPEAKER
BRACKET

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-42

DTC 81: Left hand side-air bag module (squib) system fault 1
DTC 82:Left hand side-air bag module (squib) system fault 2
DTC 85:Left hand side-air bag module (squib) system fault power squib circuit
DTC 86:Left hand side-air bag module (squib) system fault ground circuit

CIRCUIT OPERATION

•

The SRS-ECU judges how severe a collision is
by detecting signals from the left and right side
impact sensors and the analog G-sensor. If the
impact is over a predetermined level, the SRS-
ECU outputs an ignition signal. At this time, if the
safing G-sensor is on, the SRS air bag will inflate.

•

The ignition signal is input to the air bag module
to inflate the air bag.

DTC SET CONDITIONS

•

These DTC are output if communication between
the side impact sensor (LH) and the SRS-ECU is
not possible or communication is faulty.

TROUBLESHOOTING HINTS

•

Damaged wiring harnesses or connectors

•

Malfunction of the side impact sensor (LH)

•

Malfunction of the SRS-ECU

AC002964AB

Side Air Bag Module (LH) (Squib) Circuit

AC000358AF

CONNECTOR: C-74

SRS-ECU

ACCELERATOR PEDAL

CENTER REINFORCEMENT (LH)

AC002981AB

CONNECTOR: D-15