Why is my Grand Cherokee idling so high EXTREMELY high!

Tiny
JAKE 1241
  • MEMBER
  • 2000 DODGE CARAVAN
  • 265,000 MILES
The 2000 Dodge Grand Cherokee was running ok but once put on the road it started spitting n sputtering. It workeds itself out for a short time as the coolant light came on. Then I had it on the road n it seemed as if the throttle stuck at nearly full throttle but the throttle had no preasure on it n the linkage seemed to look fine too. Now it revs so high in park, drive or reverse. Of coarse it is a throttle body injection n I have NO idea where to start to diagnose this problem, any help would be much appreciated! Jake
Do you
have the same problem?
Yes
No
Friday, January 27th, 2012 AT 3:32 AM

8 Replies

Tiny
RIVERMIKERAT
  • MEMBER
My reply isn't showing up./
Was this
answer
helpful?
Yes
No
Friday, January 27th, 2012 AT 4:20 AM
Tiny
RIVERMIKERAT
  • MEMBER
First, we need to know what it is. DODGE GRAND CARAVAN? Or JEEP GRAND CHEROKEE? Then you need to scan it for codes.
Was this
answer
helpful?
Yes
No
Friday, January 27th, 2012 AT 4:21 AM
Tiny
RASMATAZ
  • MEMBER
Me too-How cold is the water
Was this
answer
helpful?
Yes
No
Friday, January 27th, 2012 AT 4:23 AM
Tiny
JAKE 1241
  • MEMBER
Sorry, it's a dodge grand caravan the water got pretty hot based on it boiling over while all this started, not sure now since I don['t want to run it long while it's revving up so high continuously vacuum hoses, sensors?
Was this
answer
helpful?
Yes
No
Friday, January 27th, 2012 AT 5:08 AM
Tiny
RASMATAZ
  • MEMBER
Clean the throttle body/plate, check the acc. Cable/linkage, test the TPS aand check the fuel pressure
Was this
answer
helpful?
Yes
No
Friday, January 27th, 2012 AT 5:10 AM
Tiny
JAKE 1241
  • MEMBER
Linkage is all good(I think) test the tps? I'm thinking about buying this van if it could be a quick fix n nothing major, what are some of the worse case possibilities? I will check those things out tomorrow for sure. Once again its as the acc is stuck or cruise is on at all time
Was this
answer
helpful?
Yes
No
Friday, January 27th, 2012 AT 5:16 AM
Tiny
RIVERMIKERAT
  • MEMBER
One type of TPS test:
ENGINE CONTROLS - TESTS W/CODES -2000 Dodge Grand Caravan SE
Page 1 of 2
DTC P0122: THROTTLE POSITION SENSOR VOLTAGE LOW

NOTE:
For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring
diagram, see WIRING DIAGRAMS article.
NOTE:
Throttle Position (TP) sensor voltage is monitored any time ignition is on.
DTC may be stored in Powertrain Control Module (PCM) if TP sensor
signal voltage is less than.16 volt. Possible causes are: defective TP sensor, defective PCM or Transmission Control Module (TCM), or
defective connectors or wiring.
1.
Turn ignition on with engine off. Using scan tool, read TP sensor voltage. If TP sensor voltage is less than.16 volt, go to next step. If TP sensor voltage is.16 volt or more, go to step 8.
Turn ignition off. Disconnect TP sensor connector. Turn ignition on with engine off. Using voltmeter, check voltage at terminal No. 3 (Violet/White wire) on TP sensor connector. If voltage
is 4 volts or more, go to next step. If voltage is less than 4 volts, repair open on Violet/White wire between PCM and TP sensor. PCM is located between driver's side front fender and power
distribution center, near battery. Perform TEST VER-5A.
Ensure TP sensor connector is still disconnected and ignition is on. Using scan tool, read TP sensor voltage. If TP sensor voltage is one volt or less, go to next step. If TP sensor voltage is
more than one volt, replace TP sensor. Perform TEST VER-5A.
Turn ignition off. Ensure TP sensor connector is still disconnected. Disconnect PCM connectors. PCM is located between driver's side front fender and power distribution center, near battery. On
models with electronically controlled 4-speed A/T, disconnect 60-pin Transmission Control Module (TCM) connector. TCM is located on passenger's side front corner of engine
compartment, on passenger's side inner fender panel. See Fig. 44.
2.
3.
4.
Fig. 44: Locating Transmission Control Module (TCM) Courtesy of DAIMLERCHRYSLER CORPORATION
5.
On all models, using ohmmeter, check resistance between ground and terminal No. 2 (Orange/Dark Blue wire) on TP sensor connector. If resistance is 5 ohms or more, go to next step.
If resistance is less than 5 ohms, repair short to ground on Orange/Dark Blue wire between PCM, TP sensor and TCM (if equipped). Perform TEST VER-5A.
Ensure connectors are still disconnected at TP sensor, PCM and TCM (if equipped). Using ohmmeter, check resistance between terminals No. 1 (Black/Light Blue wire) and No. 2
(Orange/Dark Blue wire) on TP sensor connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair Black/Light Blue wire and Orange/Dark Blue between
PCM, TP sensor and TCM (if equipped) as they are shorted togehter. PerformTEST VER-5A. Reinstall PCM connectors. Ensure connectors are still disconnected at TP sensor and TCM (if
equipped). Turn ignition on with engine off. Using scan tool, read TP sensor voltage. If TP sensor voltage is one volt or less, replace PCM. Perform TEST VER-5A. If TP sensor voltage is more
than one volt, replace TCM (if equipped). Reprogram pinion factor and perform shift quality quick learn procedure. See COMPUTER RELEARN PROCEDURES article in GENERAL
INFORMATION. Perform TEST VER-5A.
8. Ensure ignition is on with engine off. Using scan tool, monitor TP sensor voltage while wiggling wiring harness and connectors between TP sensor and PCM. PCM is located between driver's side
front fender and power distribution center, near battery. If TP sensor voltage does not change
6.
7.

1/26/2012
ENGINE CONTROLS - TESTS W/CODES -2000 Dodge Grand Caravan SE
Page 2 of 2
while wiggling wiring harness and connectors, go to next step. If TP sensor voltage changes while wiggling wiring harness and connectors, repair wiring or connectors as necessary. Perform TEST
VER-5A.
Turn ignition off. Inspect wiring harness and connectors between TP sensor and PCM. If no problems exist, go to next step. If any problems exist, repair wiring or connectors as necessary.
Perform TEST VER-5A.
10. Ensure ignition is on with engine off. Using scan tool, monitor TP sensor voltage while slowly opening and closing the throttle. If TP sensor voltage changes smoothly, test is complete. If TP
sensor voltage does not change smoothly, replace TP sensor. Perform TEST VER-5A.

1/26/2012
Was this
answer
helpful?
Yes
No
Friday, January 27th, 2012 AT 5:45 AM
Tiny
RASMATAZ
  • MEMBER
Have you checked for vacuum leak as we call as experts-False Air-if it does, the computer is gonna keep throwing fuel at it due to the leak, thinking it needs fuel-
Was this
answer
helpful?
Yes
No
Friday, January 27th, 2012 AT 5:51 AM

Please login or register to post a reply.

Recommended Guides