Turbocharger Control System Inspections Based On Diagnosis Codes - Mitsubishi 6M70 Workshop Manual

3. Inspections Based on Diagnosis Codes
3.1 Diagnosis code list
• Diagnosis codes shown by the Multi-Use Tester and those indicated by flashing of the warning lamp are different.
• The Multi-Use Tester is capable of showing more detailed diagnosis codes.
Code
P0234 Over Boost
P1130 VGT1
P1132 VGT1
P1133 VGT1
P1135 VGT2
P1137 VGT2
P1138 VGT2
P1140 VGT3
P1142 VGT3
P1143 VGT3
P1236 Turbine Revolution SNSR (Low)
P1237 Turbine Revolution SNSR (High)
P1238 Turbine Overrunning
3.2 Diagnosis code generation conditions and inspection items
P0234: Over Boost (warning lamp flashes: 54)
Generation condition
Recoverability
Control effected by electronic control unit
Service data
Inspection
Other
Message
Boost pressure remaining above the specified value for 10 seconds is repeated
five times when engine speed is at 600 rpm up to 2300 rpm.
• In the case of above problem
• System recovers if boost pressure is below the specified value when en-
gine speed is at 600 rpm up to 2300 rpm.
• In the case where above problem is repeated five more times
• System recovers (power is re-supplied to electronic control unit) if signal
becomes normal when starter switch is turned OFF (2 minutes or more)
→
ON.
• In the case of above problem
• No specific control is effected.
• In the case where above problem is repeated five more times
• Injection quantity is limited. (Output is reduced, and exhaust emissions
worsen.)
26: Boost Pressure
Turbocharger
Warning lamp indication
Flashes Red
54 –
51 –
51 –
51 –
52 –
52 –
52 –
53 –
53 –
53 –
57 –
57 –
59 –
15
Orange
O
O
O
O
O
O
O
O
O
O
O
O
O
15-15