P0102 code persists, running out of ideas..

6149 Views 5 Replies 4 Participants Last post by Willis330, Jan 19, 2021

ralvareze

Discussion Starter · Apr 27, 2020 (Edited)

Info:

2013 Chevrolet Cruze LTZ RS: 1.4 Turbo
120,000 miles
Dorman Valve Cover installed
PCV Fix Kit V3 installed

Problem:

Check engine light is on, rough idle, and the only code showing is P0102, I have replaced and done many things on the engine and the code still showing and MAF reading is 0.1g/s.

This is the list of things I've tried:

Dorman Valve Cover and PCV Fix Kit V3 installed at the same time.
MAF sensor replaced.
MAF sensor Wiring harness visually inspected.
No vacuum leaks on intercooler and tubes/hoses
Crankcase resealed.
Crankshaft front seal replaced.
Oil gauge and cap O-rings replaced.

UPDATE:
Compression test results:
Cyl1: 120psi
Cyl2: 120psi
Cyl3: 120psi
Cyl4: 150psi

Any ideas?

Could it be the turbo itself? or hoping not to be the ECU?

Thank you!

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ralvareze

Discussion Starter · #5 · Apr 30, 2020

Miguelcon74 said:
It's not the turbo for this code. This code refers to Mass Air Flow (MAF) Sensor Circuit Low Frequency.

Information
MAF Sensor

Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Ignition Voltage
P0102
P0102, P01101
P0690
P0101
Sensor
P0102, P1101
P0102, P1101
P0102*
P0101, P1101
Ground
—
P0102
—
—
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

Trace wires of maf for any of these above.

B75C Multifunction Intake Air Sensor (LUJ)

Pin
Wire
Circuit
Function
1
0.5 BN/GY
4008
Humidity Sensor Signal
2
0.5 WH/RD
3201
Throttle Inlet Absolute Pressure Sensor 5V Reference
3
0.5 GN/WH
492
Mass Air Flow Sensor Signal
4
0.5 BK
150
Ground
5
0.75 VT/BU
5294
Powertrain Main Relay Fused Supply (5)
6
0.5 YE/WH
3200
Throttle Inlet Absolute Pressure Sensor Signal
7
0.5 BK/VT
2760
Intake Air Temperature Sensor Low Reference
8
0.5 BN/VT
472
Intake Air Temperature Sensor Signal

I started tracing the harness, I'll keep it posted any result.
In the meantime I tested compression on each cylinder just for information purposes..

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Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition Voltage	P0102	P0102, P01101	P0690	P0101
Sensor	P0102, P1101	P0102, P1101	P0102*	P0101, P1101
Ground	—	P0102	—	—
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

Pin	Wire	Circuit	Function
1	0.5 BN/GY	4008	Humidity Sensor Signal
2	0.5 WH/RD	3201	Throttle Inlet Absolute Pressure Sensor 5V Reference
3	0.5 GN/WH	492	Mass Air Flow Sensor Signal
4	0.5 BK	150	Ground
5	0.75 VT/BU	5294	Powertrain Main Relay Fused Supply (5)
6	0.5 YE/WH	3200	Throttle Inlet Absolute Pressure Sensor Signal
7	0.5 BK/VT	2760	Intake Air Temperature Sensor Low Reference
8	0.5 BN/VT	472	Intake Air Temperature Sensor Signal

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