15
15-19
P1236: Turbine Revolution SNSR (Low) (warning lamp flashes: 57)
P1237: Turbine Revolution SNSR (High) (warning lamp flashes: 57)
P1238: Turbine Overrunning (warning lamp flashes: 59)
Generation condition
Turbine speed remains 3000 rpm or less for 10 seconds when engine speed is
1000 rpm or more.
Recoverability
System recovers if turbine speed remains higher than 3000 rpm for 1 second
when engine speed is 1000 rpm or more.
Control effected by electronic control unit No specific control is effected.
Inspection
Service data 2A: Turbine Revolution
Electrical equipment #835: Turbine speed sensor and pulse converter
Electric circuit diagram Turbine speed sensor and pulse converter system
Generation condition Turbine speed remains 125000 rpm or more for 10 seconds.
Recoverability
System recovers when turbine speed remains less than 125000 rpm for 1 sec-
ond.
Control effected by electronic control unit Turbocharger control is stopped.
Inspection
Service data 2A: Turbine Revolution
Electrical equipment #835: Turbine speed sensor and pulse converter
Electric circuit diagram Turbine speed sensor and pulse converter system
Generation condition Turbine speed remains 105000 rpm or more for 1 second.
Recoverability
System recovers if signal becomes normal when starter switch is turned from
OFF (2 minutes or more) to ON (power supply resumed to electronic control
unit).
Control effected by electronic control unit
• Injection quantity is stopped. (Output is reduced, and exhaust emissions
worsen.)
• Exhaust gas recirculation control is stopped.
Inspection
Service data 2A: Turbine Revolution
Electrical equipment #835: Turbine speed sensor and pulse converter
Electric circuit diagram Turbine speed sensor and pulse converter system
Other Turbocharger unit
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