SPN 51 Throttle Position Sensor (TPS)
Circuit Description
The TPS is used for engine control and governing. The TPS
monitors and controls the throttle position under all operating
conditions.
Whenever any SPN 51 FMI is detected, the power to the
Electronic Throttle Control (ETC) motor is removed and the
ETC is disabled. When this occurs, the throttle plate returns
to its "rest" position and a lower RPM limiter is engaged to
allow the engine to continue to operate, with a low idle speed.
Possible FMIs - SPN 51
The possible FMIs for SPN 51 are as follows:
FMI
Description
2
Intermittent Fail
3
Signal Voltage High
4
Signal Voltage Low/Open
NOTE:
The TPS is an integral part of the ETC, which also
consists of the ECM, MAP sensor, MAT sensor, throttle
body, and stepper motor. The ETC is not serviceable and
can not be physically tested. If any SPN 51 FMI is present,
see
TEST PROCEDURES
in this section for information on
performing the Electronic Throttle Sweep Test. Replace ETC
if test fails.
25
Not for
Reproduction
Summary of Contents for 25E300
Page 1: ...Vanguard EFI Diagnostics and Repair 25E300 REPAIR MANUAL N o t f o r R e p r o d u c t i o n...
Page 18: ...Model 25E300 EFI Component Locations 19 N o t f o r R e p r o d u c t i o n...
Page 26: ...Speed vs Voltage Table 8 27 N o t f o r R e p r o d u c t i o n...
Page 61: ...25E300 Wiring Harness Diagram 62 vanguardpower com N o t f o r R e p r o d u c t i o n...
Page 62: ...63 N o t f o r R e p r o d u c t i o n...
Page 88: ...Model 25E300 Fuel Hose Location and Routing Tankless 89 N o t f o r R e p r o d u c t i o n...
