Throttle Position (Tp) Sensor Circuit Malfunction - Mazda B-Series 1997 Workshop Manual

ON-BOARD DIAGNOSIS SYSTEM
FT
Start engine and run at idle for 2 minutes.
Is voltage between TP SIG test pin 89 and SIG RTN test
pin 91 at breakout box between 0.17 to 0.49 volts at any
time while slowly moving to open throttle from closed
position?
Note: An intermittent fault can cause a RetrieveIClear
Continuous DTC P0123. If this code is still present
after step 8 through step 10, go to step 20.
Key OFF.
Disconnect TP sensor connector.
Key ON, engine off.
Access TP PID.
Is TP PID less than 0.17 volt (3.43%)?
Diagnostic trouble code
No. P0121, P0122,
P0123, P1120, P1121,
~
P1124, Pi125
Symptom
7
Yes
THROTTLE POSITION (TP) SENSOR CIRCUIT MALFUNCTION
Input voltage from TP sensor is below 0.1 7 volts or above 4.60 volts, out of range when
ignition is turned on or inconsistent with MAF sensor signal.
Key OFF.
Connect TP sensor connector and PCM connector.
1
I
~ e s i - 1 Go to step 23.
Return KOEO and KOtiR. If DTC PI120 is
still present.
Go to step 20.
Go to next step.
Go to step 10.
ACTION
For DTC P1124:
Go to next step.
For DTC PI1 20:
Go to step 4.
For DTC P0123:
Go to step 8.
i
For DTC P0122:
STEP
1
Key OFF.
Leave TP sensor connector disconnected.
Kev ON. enaine off.
INSPECTION
Key OFF.
Inspect for damaged or pushed out pins, corrosion, loose
wires at TP or PCM connector.
Repair or replace if necessary.
Follow direction in Action.
TP SIG shorted to VREF or SIG RTN open in
TP sensor.
Replace TP sensor.
I
Go to step 11.
Is ;ohage bGtween VREF and SIG RTN circuit at TP
Go to step 23.
sensor connector between 4.0 and
6.0
volts?
to pinpoint test "VREF."
For DTC P I 121 :
Go to step 15.
For DTC P1125:
Go to step 20.
For DTC PO1 21 :
Go to step 22.
Go to pinpoint test for DTC P1400.
Go to next step.
Go to step 8.
Repair or replace as necessary.
Go to step 23.
Go to next step.
Go to step 20.
Go to next step.
I
I
!
2
3
4
5
6
Check for DTC PI400 in KOEO or KOER self-test.
Is KOEO or KOER DTC PI400 present with P1124?
Visually inspect the throttle linkage and throttle plate for
binding or sticking. Verify throttle plate and linkage is at
closed throttle position. Are plate and linkage OK?
. -
Key ON, engine off.
Access TP PID.
While slowly moving throttle frorn closed throttle position
to wide open throttle position, is TP PID reading below
0.49 volts (9.80%)?
Key OFF.
Disconnect TP sensor connector.
Key ON, engine off.
Yes
No
Yes
No
Yes
No
Yes
- -
Is voltage between VREF circuit and SIG RTN circuit at
TP sensor connector between 4.0 and 6.0 volts?
Key OFF.
Leave TP sensor connector disconnected.
Install breakout box, leave PCM disconnected.
Repair corrosion or open in
TP
SIG circuit.
Is resistance between TP SIG at TP sensor connector and
Go to step 23.
TP SIG test pin
89
at breakout box less than 5.0 ohms?
GO to pinpoint test "VREF."
C
Yes Go to next step.