04/09/2014
NT624, Troy, Mackay
http://foxwell.com.au/nt624-troy-mackay/
I needed a scanner to look at my patrol, I was in the middle of a caravan trip from Mackay to Sydney with the wife and kids, My car kept going into limp home mode and i could not drive it (well). I took it to the mechanic and he found an intermittent fault with the throttle body, cleared the codes and took the thing out of limp home more. I ordered a replacement throttle body, but realised I did not want to get caught out like this again. I called the guys at Foxwell and found them very helpful.
Troy Francis.
When Troy showed up at our shop with his Patrol, he wanted to have a look at one of our Pro Series tools. We suggested the Pro Series II -all makes- as this would best suit his needs.
When we took a took at Troys, 2001 GU Patrol (Y61) with a 4.8 lt petrol, we fist checked the engine ECU for fault codes. we found :
PO134 H02S1 (B1) - Heated O2 Sensor Bank 1 Sensor 1
P1122 ETC FUNCTION/CRC - Throttle Body Actuation -Electronic Traction Control
P1123 ETC Mot RLY/CRC - Electronic Traction Control - Motor Relay
As per usual we cleared the codes in case they where caused during a previous inspection / repair.
Clearing the codes left the fault code :
P1122 ETC FUNCTION/CRC - Throttle Body Actuation -Electronic Traction Control
A quick check of the live data for the Throttle Body motor, when graphed against the Throttle Position Sensor, revealed that the throttle body motor was in-fact intermittently faulty. Causing a correlation error -Throttle position sensor not accurately reflecting the a accelerator position sensor.
Next we decided to do a quick check on the fault code :
PO134 H02S1 (B1) - Heated O2 Sensor Bank 1 Sensor 1
As this would take a drive cycle (potentially to reset). We naviaged to the live data for the both O2 Sensors and graphed them together. With O2 Sensors, the general rule of thumb is to see them switch between rich and lean (0.1 -ish- and 0.9 -ish- Volts) around 8 times over 10 seconds at 2000 rpm. Watching each O2 sensor signal we counted the crosses (switching between 0.1 - 0.9) and found that wile the bank 2 (rear) sensor was switching around 5 times (a lazy sensor) the bank 1 (front) was struggling to make 3 switches. Both sensors where more often on the lean side. So although not technically a current fault, I suggested that Troy also repalce his O2 sensors as they are both currently lazy -one more so than the other- and likely to need replacement in the future.
