Mitsubishi L200. Manual - part 70

TROUBLESHOOTING

DIESEL FUEL

13A-76

STEP 5. Check harness between A-135 (terminal
No. 4) air flow sensor connector and C-103
(terminal No. 155) engine-ECU connector.

• Check earthing line for open circuit.

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Repair the damaged harness wire.

STEP 6. M.U.T.-III data list

• Refer to Data List Reference Table

P.13A-542

a. Item 114: Air flow sensor

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

− How to Use Troubleshooting/

Inspection Service Points

− How to Cope

with Intermittent Malfunctions ).

NO :

Replace the engine-ECU. When the engine-
ECU is replaced, write the chassis number
(Refer to GROUP 00

− Precautions Before

Service

− How to Perform Chassis Number

Writing ). After replacing the engine-ECU,
register the injector identification code and
learn fuel injection (Refer to GROUP 00

−

Precautions Before Service

− What The

Common Rail Engine Learns ). After
registering the injector identification code,
the vehicle equipped with the DPF carries
out the forcible DPF regeneration. (Refer to
GROUP 17

− Emission Control − Diesel

Particulate Filter (DPF) System

− Forcible

DPF Regeneration ).

STEP 7. M.U.T.-III data list

• Refer to Data List Reference Table

P.13A-542

a. Item 114: Air flow sensor

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

− How to Use Troubleshooting/

Inspection Service Points

− How to Cope

with Intermittent Malfunctions ).

NO :

Replace the air flow sensor.

AKA00399

Harness side
connector

A-135 (B)

Connector: A-135

AKA00090

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

146

147

148

149

150

151

152

153

154

155

156

157

158

117

145

116

144

C-103 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-103

TROUBLESHOOTING

DIESEL FUEL

13A-77

Code No. P0106: Manifold Absolute Pressure Sensor Range/Performance Problem

OPERATION

• A power voltage of 5 V is applied to the manifold

absolute pressure sensor power terminal (termi-
nal No. 1) from the engine-ECU (terminal No. 72)
and earthed to the engine-ECU (terminal No. 31)
from the manifold absolute pressure sensor (ter-
minal No. 3).

• The sensor signal is inputted to the engine-ECU

(terminal No. 37) from the manifold absolute
pressure sensor output terminal (terminal No. 2).

FUNCTION

• The manifold absolute pressure sensor converts

the manifold absolute pressure into a voltage sig-
nal and inputs the signal to the engine-ECU.

• In response to the signal, the engine-ECU cor-

rects the fuel injection amount, etc.

TROUBLE JUDGMENT

Check Conditions

• Battery positive voltage is 8 − 16 V

• 2 seconds later after the ignition switch has been

in "ON" position or the engine has started up.

• The following 3 conditions are formed:

1. The engine cooling water temperature is from

−5 to 80 °C.

2. The air intake temperature is from

−5 to 80

°C.

3. The atmospheric pressure is from 76 to 120

kPa.

Judgment Criterion

• When an idle state and an engine rotation speed

of 2,000 r/min continue for three seconds, mani-
fold absolute pressures are read and the differ-
ence between them goes under 800 Pa for 1
second.

PROBABLE CAUSES

• Failed manifold absolute pressure sensor

• Manifold absolute pressure sensor circuit har-

ness damage or loose connector contact.

• EGR cooler clogged.

• EGR pipe (A, B) clogged.

• Failed engine-ECU

AKA00093

5 6 7 8 9

10 1112 13 14 15 16 17 18 19 20 21 22 23 24

25 26

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72

43 44 45 46 47 48

73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96

Engine-ECU

LG-B

G-L

A-105

Manifold
absolute
pressure
sensor

Manifold Absolute Pressure Sensor Circuit

Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Grey
R: Red P: Pink V:Violet PU: Purple SI:Silver

C-105

5 V

TROUBLESHOOTING

DIESEL FUEL

13A-78

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Refer to Data List Reference Table

P.13A-542

a. Item 6: Manifold absolute pressure sensor

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Go to Step 2.

STEP 2. Connector check: A-105 manifold
absolute pressure sensor connector

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair or replace the connector.

STEP 3. Perform voltage measurement at A-105
manifold absolute pressure sensor connector.

• Use special tool test harness (MB991709) to con-

nect connector, and measure at pick-up harness.

• Ignition switch: ON

• Voltage between terminal No. 1 and earth.

OK: 4.9

− 5.1 V

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 4.

STEP 4. Connector check: C-105 engine-ECU
connector

Q: Is the check result normal?

YES :

Check and repair harness between A-105

(terminal No. 1) manifold absolute pressure
sensor connector and C-105 (terminal No.
72) engine-ECU connector.

• Check power supply line for damage.

NO :

Repair or replace the connector.

AK900797

3 2

Harness side
connector

A-105 (L)

Connector: A-105

AK900797

3 2

Harness side
connector

A-105 (L)

Connector: A-105

AKA00089

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AK900797

3 2

Harness side
connector

A-105 (L)

Connector: A-105

TROUBLESHOOTING

DIESEL FUEL

13A-79

STEP 5. Perform voltage measurement at A-105
manifold absolute pressure sensor connector.

• Use special tool harness (MB991709) to connect

connector, and measure at pick-up harness.

• Ignition switch: ON

• Voltage between terminal No. 3 and earth.

OK: 0.5 V or less

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Go to Step 6.

STEP 6. Connector check: C-105 engine-ECU
connector

Q: Is the check result normal?

YES :

Check and repair harness between A-105

(terminal No. 3) manifold absolute pressure
sensor connector and C-105 (terminal No.
31) engine-ECU connector.

• Check earthing line for damage.

NO :

Repair or replace the connector.

AK900797

3 2

Harness side
connector

A-105 (L)

Connector: A-105

AKA00089

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AK900797

3 2

Harness side
connector

A-105 (L)

Connector: A-105

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