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4 Posts
I replaced my old 91 hard body with a frontier, here's my story:
TRUCK: 2004 Frontier 4 cyl, A/T, 38,000mi (YES, THIRTY EIGHT THOUSAND MILES, carfax verified)
When I purchased this truck I knew it had issues, first, a busted radiator (1st thing I replaced), then, the truck is in a limp mode, it won't go past 2000 rpm and the transmission also does not respond: no reverse, no neutral (it moves forward when in it), 1st and 2nd gear sometimes engage and sometimes not, Overdrive is the only constant; But I don't know if all these have something to do with the truck being in limp mode or not, my first concern is to get it out of that mode, and here is where I need your help. SO far I've done the following:
- Cleaned the MAF sensor, throttle body, and its surroundings
- Inspected the air and fuel hoses for leaks and damage and found no apparent issue.
-Then I checked the electrical wiring connections at the sensors, I even checked the throttle position sensor wires for continuity, voltage and grounding and found they work within its limits, finally I have a VCDS scanner which I previously bought to work on my VW and used to scan the truck using the OBDII mode, this is what I've got:
VCDS Release 908.1: Generic OBD2
Mode 1: Read Data
03: Fuel system 1/2 status Closed loop, using O2 sensors
04: Calculated load value 22.7 % (9.5-34%)
05: Engine coolant temperature 74 °C (supposed to be between 75 and 85 degrees)
06: Short Term Trim - Bank 1 -3.1 % (????)
07: Long Term Trim - Bank 1 0.0 %
12: Engine RPM 825 /min (little high, specs call for 750 +/- 50 rpm)
13: Vehicle speed 0 km/h
14: Ignition timing advance for cyl #1 20.0 Degrees (20+/-5 BTDC)
15: Intake air temperature 19 °C
16: Mass Air Flow 5.04 g/s (0.9-5-8 g/s)
17: Throttle position sensor 0.0 %
19: Location of O2 sensors B1S1 B1S2
20: Bank 1 Sensor 1 Status 0.110 V -7.03 %(lean) (????)
21: Bank 1 Sensor 2 Status 0.270 V
28: OBD Requirements Met OBD II (CARB)
33: Distance travelled with MIL on 1 km
Number of DTCs stored: 0 -- MIL Status: MIL OFF
Misfire monitoring: Passed
Fuel System: Passed
Comprehensive Components: Passed
Catalyst monitoring: Failed or Incomplete
Heated catalyst monitoring: Not installed.
Evaporative system monitoring: Failed or Incomplete
Secondary air system monitoring: Not installed.
A/C system refrigerant monitoring: Not installed.
Oxygen sensor monitoring: Failed or Incomplete
Oxygen sensor heater monitoring: Failed or Incomplete
Exhaust Gas Recirculation: Failed or Incomplete
Having found no DTCs stored or pending to know at least where to start (Thought the VAG scanner could not read the CPU completely) , I went and got a CEN-TECH scanner at Harbor Freight and again scanned it to find a DTC, the results were even more unclear, majority of test were "not supported or stored data".
I searched for these topics in the forums to get an idea where to continue to get the truck out of the “safe mode” and found some posts with similar situations, even found one where the transmission switch was suggested to be the culprit, but having no DTCs present and NO MIL to go get a good start has got my head spinning.
So, If anybody can give me an idea were to beging dissecting the problems or suggest a better scanner to look deeper into the brain of the CPU I'd welcome suggestions, I heard that Autel MaxiDiag JP701 Diagnostic Scan Tool is a good option, but after the experience with CEN-TECH I'm not sure, unless someone with firsthand experience can recommend it.
I thank in advance to all of you that can point me in the right direction.
TRUCK: 2004 Frontier 4 cyl, A/T, 38,000mi (YES, THIRTY EIGHT THOUSAND MILES, carfax verified)
When I purchased this truck I knew it had issues, first, a busted radiator (1st thing I replaced), then, the truck is in a limp mode, it won't go past 2000 rpm and the transmission also does not respond: no reverse, no neutral (it moves forward when in it), 1st and 2nd gear sometimes engage and sometimes not, Overdrive is the only constant; But I don't know if all these have something to do with the truck being in limp mode or not, my first concern is to get it out of that mode, and here is where I need your help. SO far I've done the following:
- Cleaned the MAF sensor, throttle body, and its surroundings
- Inspected the air and fuel hoses for leaks and damage and found no apparent issue.
-Then I checked the electrical wiring connections at the sensors, I even checked the throttle position sensor wires for continuity, voltage and grounding and found they work within its limits, finally I have a VCDS scanner which I previously bought to work on my VW and used to scan the truck using the OBDII mode, this is what I've got:
VCDS Release 908.1: Generic OBD2
Mode 1: Read Data
03: Fuel system 1/2 status Closed loop, using O2 sensors
04: Calculated load value 22.7 % (9.5-34%)
05: Engine coolant temperature 74 °C (supposed to be between 75 and 85 degrees)
06: Short Term Trim - Bank 1 -3.1 % (????)
07: Long Term Trim - Bank 1 0.0 %
12: Engine RPM 825 /min (little high, specs call for 750 +/- 50 rpm)
13: Vehicle speed 0 km/h
14: Ignition timing advance for cyl #1 20.0 Degrees (20+/-5 BTDC)
15: Intake air temperature 19 °C
16: Mass Air Flow 5.04 g/s (0.9-5-8 g/s)
17: Throttle position sensor 0.0 %
19: Location of O2 sensors B1S1 B1S2
20: Bank 1 Sensor 1 Status 0.110 V -7.03 %(lean) (????)
21: Bank 1 Sensor 2 Status 0.270 V
28: OBD Requirements Met OBD II (CARB)
33: Distance travelled with MIL on 1 km
Number of DTCs stored: 0 -- MIL Status: MIL OFF
Misfire monitoring: Passed
Fuel System: Passed
Comprehensive Components: Passed
Catalyst monitoring: Failed or Incomplete
Heated catalyst monitoring: Not installed.
Evaporative system monitoring: Failed or Incomplete
Secondary air system monitoring: Not installed.
A/C system refrigerant monitoring: Not installed.
Oxygen sensor monitoring: Failed or Incomplete
Oxygen sensor heater monitoring: Failed or Incomplete
Exhaust Gas Recirculation: Failed or Incomplete
Having found no DTCs stored or pending to know at least where to start (Thought the VAG scanner could not read the CPU completely) , I went and got a CEN-TECH scanner at Harbor Freight and again scanned it to find a DTC, the results were even more unclear, majority of test were "not supported or stored data".
I searched for these topics in the forums to get an idea where to continue to get the truck out of the “safe mode” and found some posts with similar situations, even found one where the transmission switch was suggested to be the culprit, but having no DTCs present and NO MIL to go get a good start has got my head spinning.
So, If anybody can give me an idea were to beging dissecting the problems or suggest a better scanner to look deeper into the brain of the CPU I'd welcome suggestions, I heard that Autel MaxiDiag JP701 Diagnostic Scan Tool is a good option, but after the experience with CEN-TECH I'm not sure, unless someone with firsthand experience can recommend it.
I thank in advance to all of you that can point me in the right direction.