Join Date: Feb 2008
I will assume the 98 wiring colors are the same as 97....so check before you rely upon my wiring colors:
Ok...try to start it again. If it doesnt start, do this:
Disconnect the TPS connector, turn the key to "ON" ( not "start") ....and test for +5 VDC coming from the PCM at the harness side of the connector.
If it's low...leave the TPS disconnected and begin performing the same test on the CPS connector, MAP , and Cam sensor connector....leaving them disconnected, one by one. If one of them is pulling it to ground, disconnecting it should allow it to reach 5 V again.
The 5 V feed wire should be wht/blk,....**** IF it's the same color as a 97.***
If you still do not have 5 Volts after disconnecting them all....then you move to visually inspecting the wire as it travels from sensor to sensor and/or making sure that your grounds are good.
If you STILL dont have 5volts on that circuit, then move to the voi/wht wire on the back of the transfer case ( speed sensor) then the gov pressure solenoid in the tranny.
Either way you want to go about it is fine, but you will need that 5 Volts. If it's down, something is causing it to go down....either a bad sensor, a high resistance short to ground, or a bad 5 V power supply in the PCM.....or even "bad" or intermittent 12v going TO the PCM....or ground.
2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.