Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 247

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-187

STEP 13. Check for short circuit to ground and harness
damage between left bank heated oxygen sensor (rear)
connector B-23 terminal 4 and ECM connector C-62
terminal 73 <M/T> or PCM connector C-59 terminal 73 <A/
T>.
Q: Is the harness wire in good condition?

YES : Go to Step 14.
NO : Repair it. Then go to Step 15.

STEP 14. Check the left bank heated oxygen sensor (rear).
(1) Disconnect the left bank heated oxygen sensor (rear)

connector B-23 and connect test harness special tool,
MB991316, to the connector on the left bank heated oxygen
sensor (front) side.

(2) Warm up the engine until engine coolant 80

°

C (176

°

F) or

higher.

CAUTION

Be very careful when connecting the jumper wires;
incorrect connection can damage the left bank heated
oxygen sensor (rear).
(3) Use the jumper wires to connect terminal 1 (red clip) to the

positive battery terminal and terminal 3 (blue clip) to the
negative battery terminal.

(4) Connect a digital volt meter between terminal 2 (black clip)

and terminal 4 (white clip).

(5) While repeatedly revving the engine, measure the left bank

heated oxygen sensor (rear) output voltage.

Standard value: 0.6

−

1.0 V

Q: Is the voltage at the standard value?

YES : Replace the ECM or PCM. Then go to Step 15.
NO : Replace the left bank heated oxygen sensor (rear).

Then go to Step 15.

AK000214

AK000214AB

CONNECTOR : B-23

AK000225

CONNECTOR : C-62<M/T>, C-59<A/T>

C-59

C-62

PCM<A/T>

ECM<M/T>

AL

ACX02488

CONNECTOR : B-23

LEFT BANK
HEATED OXYGEN
SENSOR (REAR)

AC

AKX01625 AB

BLUE

JUMPER
WIRES

BLACK

RED

WHITE

MB991316

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-188

STEP 15. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,

Procedure 4

−

Heated oxygen Sensor Monitor and

Procedure 6

−

Other Monitor (

P.13B-4

).

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0156 is output?

YES : Retry the troubleshooting.
NO : The inspection is complete.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-189

DTC P0159: O

2

Sensor Circuit Slow Response (bank 2 sensor 2)

AK000696

BLA

CK

BLA

CK

GREEN

3 4

1 2

FROM MFI RELAY

LEFT BANK HEATED
OXYGEN SENSOR(REAR)

TO ECM
OR PCM

73<M/T>*2
73<A/T>*4

49<M/T>*1
57<A/T>*3

1

3

2

4

B-23
MU802665

NOTE
*1:ECM connector C-58<M/T>
*2:ECM connector C-62<M/T>
*3:PCM connector C-55<A/T>
*4:PCM connector C-59<A/T>

ENGINE CONTROL
MODULE(ECM)<M/T>
OR
POWERTRAIN CONTROL
MODULE(PCM)<A/T>

65

43
50

42
49

41
48
60 61

64

46 47
58 59
67 68

45

56
66

52

51

44

53

62

54

63

57

55

C-58<M/T>
(MU803782)

C-55<A/T>
(MU803781)

42 43
48 49 50 51 52 53 54 55 56 57

46

45

44

58 59

60 61 62 63

64 65 66

47

41

98

78

71

88 89

76 77

72
79
91

73
80

74

75

81
92

82 83
93

84 85

94

86 87

95 96

90

80

87

81

94

85

82

84

93

86

98

99

74

92

73

83

88

91

95

97

96

100

89

78

71

90

76 77

75

72
79

97

C-62<M/T>
(MU803783)

C-59<A/T>
(MU803782)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-190

CIRCUIT OPERATION

•

A voltage corresponding to the oxygen
concentration in the exhaust gas is sent to the
ECM (terminal 73) <M/T> or PCM (terminal 73)
<A/T> from the output terminal (terminal 4) of the
left bank heated oxygen sensor (rear).

•

Terminal 2 of the left bank heated oxygen sensor
(rear) is grounded with ECM (terminal 49) <M/T>
or PCM (terminal 57) <A/T>.

TECHNICAL DESCRIPTION

•

The output signal of the left bank heated oxygen
sensor (front) is compensated by the output
signal of the left bank heated oxygen sensor
(rear).

•

The ECM <M/T> or PCM <A/T> checks for an
open circuit in the left bank heated oxygen sensor
(rear) output line.

DTC SET CONDITIONS

Check Conditions

•

Engine coolant temperature is higher than 82

°

C

(180

°

F).

•

Barometric pressure is higher than 76 kPa (11
psi).

•

The left bank heated oxygen sensor (front) is
active.

Judgement Criteria

•

The heated oxygen sensor (rear) output voltage,
before the fuel shut off is started, was 0.4 volts or
more, and during the shut off, it takes one second
or more for the heated oxygen sensor (rear)
output voltage to fall from 0.4 to 0.15 volts.

or

•

The heated oxygen sensor (rear) output voltage,
before the fuel shut off is started, was 0.15 volts
or more, and during the shut off, it takes three
seconds or more for the heated oxygen sensor
(rear) output voltage to fall below 0.15 volts.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

•

Left bank heated oxygen sensor (rear) failed.

•

Open circuit in left bank heated oxygen sensor
(rear) output line.

•

Open circuit in left bank heated oxygen sensor
(rear) ground line.

•

ECM failed. <M/T>

•

PCM failed. <A/T>

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

ACX02488

CONNECTOR : B-23

LEFT BANK
HEATED OXYGEN
SENSOR (REAR)

AC

AK000225

CONNECTORS : C-58, C-62<M/T>,
C-55, C-59<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

AK

C-59

C-62