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won't start


 
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daddo
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Joined: 14 Nov 2005
Location: Florida

PostPosted: Mon Nov 14, 2005 9:06 am    Post subject: won't start Reply with quote

Hi, 1997 wrangler sport, 5spd, 4.0L. Has been fine with common hard to start problem (1st crank for about 3 seconds, stop, then crank again and always starts - doesn't matter hot or cold, doesn't matter if turn to on for a while). NOW... went to start, dash lights come on, a click then nothing. No dash lights, no noise. Let sit awhile, get dash lights in on position, turn to start get click then no dash lights and silent.
Took battery to autoparts store tester, tested good.
Replaced starter relay. No change.
Shorted starter solenoid, starter turned over.
Removed and cleaned; battery terminals, engine and firewall (frame) ground, and hot lead to fuse box on fender. No change.
All this time I'm disconnecting/ reconnecting/ battery.
Now I have no under hood or dash lights.
Pulled ignition switch (not cylinder), hot wired (connected) pink/black from battery to blue (run?) then touched yellow (starter) to connection...nothing.
A schematic I have shows a continuous pink/black wire from fuse #2(40amp)(battery) through a connector to ignition switch. My multitester showed good circuit from switch to fuse and battery to fuse.
The schematic also shows yellow/red from starter relay to a connector then fuse #20(20amp) becoming yellow (no stripe) to ignition switch. In this jeep the yellow/red from the starter relay disapears into the harness. It does not go to fuse #20. Fuse #20 has two little pink wires that disapear into the harness. My multitester shows no continuity from starter relay yellow/red to yellow at switch. I ran a 12guage wire with an inline 15amp fuse (I didn't have a 20) from starter relay post to ignition switch. Hot wire nothing, reconnect switch nothing.
It would be great to find and solve the problem, but at this point I'm ok to tow it to a shop or jeep dealer.
Any ideas??? A short somewhere in the harness?, a problem with the starter?, a problem with the control module?, switch, cylinder???
Also, What is the purpose and function of the wired plastic round piece that fits into the battery tray under the battery?.
Big deal huh?. Can I even volt drop test if I have no power to circuits?.
Any help would be wonderful, Thanks very much, Earl
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IBTJn
Moderator
Moderator


Joined: 31 Dec 2004
Location: Just Outside of Portland, OR

PostPosted: Mon Nov 14, 2005 4:38 pm    Post subject: Re: won't start Reply with quote

daddo wrote:

Shorted starter solenoid, starter turned over.
Removed and cleaned; battery terminals, engine and firewall (frame) ground, and hot lead to fuse box on fender. No change.

I say replace your battery cables. They don't last forever, and often begin to show they are having a problem by your earlier symptons. Worse case, you'll have eliminated that possibility.

Just my $.02

Wink
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daddo
Member


Joined: 14 Nov 2005
Location: Florida

PostPosted: Tue Nov 15, 2005 4:07 pm    Post subject: Reply with quote

Guess what?, That was it. I used jumper cables to bridge each lead, It was the lead from the + terminal to the fuse block. Corroded wire at the terminal. Thanks a bunch.
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T.O.W. Vehicle
Member


Joined: 15 Jun 2004
Location: Summerville, SC

PostPosted: Wed Nov 16, 2005 6:21 am    Post subject: Re: won't start Reply with quote

daddo wrote:
Hi, 1997 wrangler sport, 5spd, 4.0L.
Also, What is the purpose and function of the wired plastic round piece that fits into the battery tray under the battery?.
Thanks very much, Earl


It is the battery temperature sensor.

...from the FSM:

BATTERY TEMPERATURE SENSOR

DESCRIPTION

The Battery Temperature Sensor (BTS) is attached
to the battery tray located under the battery.

OPERATION

The BTS is used to determine the battery temperature and control battery charging rate. This temperature data, along with data from monitored line voltage, is used by the PCM to vary the battery charging rate. System voltage will be higher at colder temperatures and is gradually reduced at warmer temperatures.

The PCM sends 5 volts to the sensor and is grounded through the sensor return line. As temperature increases, resistance in the sensor decreases and the detection voltage at the PCM increases.

The BTS is also used for OBD II diagnostics. Certain faults and OBD II monitors are either enabled or disabled, depending upon BTS input (for example, disable purge and enable Leak Detection Pump (LDP) and O2 sensor heater tests). Most OBD II monitors are disabled below 20 degrees F.
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