SERVICE MANUAL NUMBER 24
DIAGNOSTICS
Code 21 (2 of 3): Throttle Position (TP) Sensor Circuit
Step
Action
Yes
No
PROCEED TO
Was the “On-Board Diagnostic” (OBD) System Check
Performed?
1.
2.
Step 2.
OBD
Are you using a Scan Tool?
a. Throttle closed.
Step 3. Step 7.
b. Ignition ON.
Does scan tool indicate throttle position sensor volt-
age greater than 4 volts?
3.
4.
Step 6. Step 4.
Step 5. Step 4.
Does scan tool indicate throttle position sensor volt-
age less than .3 volts?
Code 21 is intermittent, refer to “Diagnostic Aids” on
facing page.
–
–
a. Ignition OFF.
b. Disconnect throttle position sensor electrical connector.
Jumper throttle position sensor harness terminals “A”
and “C” together.
5.
6.
c. Ignition ON
Does scan tool indicate throttle position sensor volt-
age greater than 4 volts?
Step 15. Step 7.
Step 13. Step 7.
a. Ignition OFF.
b. Disconnect throttle position sensor connector.
c. Ignition ON.
Does scan tool indicate voltage over 4 volts?
a. Ignition OFF.
b. Disconnect throttle position sensor harness connector.
c. Ignition ON.
7.
8.
d. Connect DVOM from harness terminal “A” (5 volt refer-
ence to harness terminal “B” (sensor ground).
Is voltage reading over 4 volts?
Step 8. Step 11.
Step 9. Step 10.
Connect DVOM from harness terminal “A” (CKT 416) to
harness terminal “C” (throttle position sensor signal, CKT
417).
Is voltage reading over 4 volts?
Index
90-861327--1
OCTOBER 1999
Page 5G-59
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(1 votes, average: 4 out of 4)
Marine readers have rated Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID 4.0 out of 4.0 based on 1 product reviews. Great performance engine.
Class 1