96
DTC 51 ETC TPS 1 Range
Step Action Value(s) Yes No
1
Did you perform the On-board diagnostics
(OBD) system check?
NOTE: If the 5 volt reference Supply 1 is shorted
to ground, various codes may set, including
Throttle, Pedal 1, Oil Pressure, Cam and 5 Volt
Power Supply Codes. If multiple codes are set,
refer to diagnostics for codes 524261 to verify 5
volt reference.
Go to Step
(2)
Go to On-
Board Diag-
nostics
System
Check/Malfun
ction indicator
lamp.
2
With the monitor connected, Key ON, read
both throttle position sensors 1 and 2 voltag-
es.
Is either reading below 0.2 volts
Is the TPS 1 voltage above 9.95 volts or is
TPS 2 voltage above 4.99
Is the higher voltage minus the lower voltage di-
vided by 5 then multiplied by 100 greater than 6.
NOTE: this is the formula the ECU uses to de-
termine if the TPS readings are within the
specifications
TPS 1
<0.2V
TPS 2
>4.99V
Go to Step
(3)
Intermittent
problem. Go
to Preliminary
and Intermit-
tent Checks
3
Key OFF, disconnect C017 from the throttle
body.
Key ON, measure the voltage from C017 pin
6 to pin 2
Is the voltage between 4.8 and 5.2 volts?
Between
4.8-5.2V
Go to Step
(5)
Go to Step (4)
4
Key OFF, disconnect ECU-B
Measure the resistance from C017 pin 2 to
ECU B pin G2
Measure the resistance from C017 pin 6 to
ECU B pin G4
Is the resistance less than 5?
NOTE: Do not probe wires without proper ser-
vice tool. Permanent harness damage may
result.
Verify that
there are no
codes for the
5 volt supply
before pro-
ceeding.
Replace the
ECU. Go to
Step (9)
Repair the
circuit as ne-
cessary. Refer
to Wire Har-
ness Repair.
Go to Step (9)
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