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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.
3.2 Diagnosis code generation conditions and inspection items
P0234: Over Boost (warning lamp flashes: 54)
Code Message
Warning lamp indication
Flashes Red Orange
P0234 Over Boost 54 – O
P1130 VGT1 51 – O
P1132 VGT1 51 – O
P1133 VGT1 51 – O
P1135 VGT2 52 – O
P1137 VGT2 52 – O
P1138 VGT2 52 – O
P1140 VGT3 53 – O
P1142 VGT3 53 – O
P1143 VGT3 53 – O
P1236 Turbine Revolution SNSR (Low) 57 – O
P1237 Turbine Revolution SNSR (High) 57 – O
P1238 Turbine Overrunning 59 – O
Generation condition
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.
Recoverability
• 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.
Control effected by electronic control unit
• 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.)
Inspection
Service data 26: Boost Pressure
Other Turbocharger
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