1991 Mustang GT

William Everette via CarKB.com · 2005-04-08T06:17:43+00:00

Wife said car(and I verified) that she lost speed control, got a checkengine light, and the transmission doesn't want to respond correctly (ex.slow to engage when accelerating after having slowed down for an off ramp,or speeding up to pass).First engine scan gave the following errors:KOEO Codes- 23 Throttle Position Sensor is out of range Memory Codes- 31 EGR valve position or exhaust pressure transducer sensor voltage low63 Throttle Position Sensor voltage too low or grounded KOER Codes- 12 Cannot control RPM during self check or Idle Speed Control Problem23 Throttle Position Sensor is out of rangeCleared codes, unplugged TPS and scanned a second time and got these errors:KOEO Codes- 98 Electronic Pressure Control driver failure in control module (or hardfault) 63 Throttle Position Sensor voltage too low or grounded Memory Codes- 11 System Pass KOER Codes- 12 Cannot control RPM during self check or Idle Speed Control Problem23 Throttle Position Sensor is out of rangeIt's having issues obviously, but it's the Memory code 11 that throws me.That seems to signify that the electronics are fine but the 98 seems tomean everything is screwed. This car has some age on it but was kept (Ithough well) by the previous family member. Could the TPS, EGR and SpeedControl all be bad at the same time? Or am I looking at a bad ECU supplyingbad voltage to the sensors? I thought I was looking at replacing an ECU atfirst. All the parts put together aren't too much to replace, but I'dprefer a simple fix. Yes, it passed a wiggle test.

Apr 08, 2005 22 Replies

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<memset 21 years ago

"Grammar". Spelling lesson over.

-Mike

-- Melt away the Cellulite with Cellulean!

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Stephan Rose 21 years ago

Can you check the actual EGR and TPS Voltages? Post some numbers?

-- Stephan

2001 Yamaha YZF-R6

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William Everette via CarKB.com 21 years ago

I need to swap out the TPS. Auto store gave me the wrong one. I'll get voltages tonight if it doesn't rain.

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