SPN 51, FMI 1 - TPS1 % Lower Than TPS2 % Key On, Engine Off System Mode=”Stopped” Enable ‘DBW Test’ mode Slowly depress FPP sensor NOTE: To sweep throttle on stationary applications, go to DBW page and type desired throttle opening % in the TPS Command box.
Is TPS1 and TPS2 difference more than 20%?
Yes
Key Off Disconnect throttle from harness Key On, Engine Off System Mode=”Stopped” Enable ‘DBW Test’ mode
No Intermittent Problem
Connect TPS1 signal to the 5V reference at throttle connector while observing TPS1 voltage.
Yes Is the voltage for both TPS1 and TPS2 < 0.100 VDC?
Repeat for TPS2
No TPS (the one over 0.1volts) is shorted to voltage in the harness Faulty ECM
Yes
Faulty Connection at Throttle Faulty Throttle
Does DST display both TPS1 and TPS2 voltage over 4.90 VDC when each is connected to 5Vref?
No Key off Disconnect wireharness header from ECM Carefully remove yellow lock from header at device output terminal CAREFULLY check resistance between TPS1 & 2 input at ECM header and signal at device. NOTE: DO NOT INSERT probe or object into terminals as this will cause the terminal to spread and may no longer make contact with ECM pin. Spread pins will void warranty! Probe on the side of terminal.
TPS1 or TPS2 signal shorted to ground in harness Faulty ECM connection Faulty ECM
Yes
Are both resistances < 5 ohms?
No Faulty Harness
Indmar Products
2008 44
All Rights Reserved Draft Rev. A-Jan. 2008
