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Oh lol ok thank you so much. Im gonna continue check engine light diagnostics for now. Sorry for all the questions im pretty paranoid when it comes to my car even my grandad agrees
Ok so scanner works now, did a test run at idle. Observations are as follows
codes thrown before evens starting engine: 22 Throttle pos sensor too low
Exhaust oxygen_lean
At min 0 (start):
Loop_open
RPM: 1625, 02(mv): 438, Integratr: 128
IAC pos 134
A/F learned: no, block learn 128
TPS(V): 0.02
Coolant: 78f
02 cross counts 0
E-cell expired yes
CCP solenoid On
Map(kPa): 34
Map(v): 1.30
Knock: no, knock retard 0
5 mins in
Loop_open
RPM: 850, 02(mv): 385, Integratr: 128
IAC pos 46
A/F learned: no, block learn 128
TPS(V): 0.02
Coolant: 147f
02 cross counts 0
E-cell expired yes
CCP solenoid On
Map(kPa): 41
Map(v): 1.68
Knock: no, knock retard 0
At 6 mins in, switch to closed loop
Loop_closed
RPM: 750, 02(mv): 358, Integratr: 128
IAC pos 41
A/F learned: yes, block learn 128
TPS(V): 0.02
Coolant: 155f
02 cross counts 0
E-cell expired yes
CCP solenoid On
Map(kPa): 39
Map(v): 1.54
Knock: no, knock retard 0
It switched to open loop once more about 3 mins later, but quickly reverted back to closed loop. I ended the test at 10 mins with this data
Loop_closed
RPM: 1000, 02(mv): 358, Integratr: 158
IAC pos 35
A/F learned: yes, block learn 158
TPS(V): 0.02
Coolant: 180f
02 cross counts 0
E-cell expired yes
CCP solenoid On
Map(kPa): 32
Map(v): 1.16
Knock: no, knock retard 0
Im gonna be doing alot of looking into what some of these PIDs mean. Any observations from this?
Edit: I have found the meanings to most of the PID's, though still no explanation for the high idle. I can post the pid descriptions if necessary.
No, everything else looks good. The reason it went back into open loop is because the O2 sensor is located so far back it cools down at idle. This is why new cars have heated O2 sensors. Nothing to worry about it.
Ah I understand the open loop part. But are you sure about the lean condition? My thinking is that it detects lean, so it responds by enriching mixture?
Anyhow here a picture of the original prom. Note car is California emissions car.
wow super cool thread. Yea I can’t see my prom there but i wonder if it’s because cali has a different prom? I’m trying to find any info on this prom online but I’m getting nothing. My worry is prev owner installed a performance prom.
Some say it does. I've played with mine and didn't change anything. But that low TPS voltage will throw a code.
so I did some testing on the tps, and I think it needs replacing. I tested it by removing it, putting 5v into the 5v port and negative on sensor ground, and voltmeter from tps (pin b) and sensor ground. The reading doesn’t change as I move the handle on the sensor. Same thing when I keep the sensor attached to the car, voltage doesn’t change even at full throttle. My question is how necessary is this sensor? Asking because new one costs $80
so I did some testing on the tps, and I think it needs replacing. I tested it by removing it, putting 5v into the 5v port and negative on sensor ground, and voltmeter from tps (pin b) and sensor ground. The reading doesn’t change as I move the handle on the sensor. Same thing when I keep the sensor attached to the car, voltage doesn’t change even at full throttle. My question is how necessary is this sensor? Asking because new one costs $80
Ok thank you. Ordered one. Can I ask what the ECM does with the reading? the manual doesnt go into its purpose, but I imagine its used to adjust mixture?
