FAQ
TL;DR: MAN TGX 2010 PTM code 05622-05 points to PTO1 (1 high‑side output) short‑to‑ground; “PTO 1 high side output, short-circuit to earth.” Check the solenoid/wiring or de-code PTO if hardware is removed. [Elektroda, darfur5, post #16663503]
Why it matters: This code can disable PTO functions and confuse downstream diagnostics unless you fix the circuit or reconfigure PTM for no-PTO use.
Quick Facts
- Code meaning: PTM 05622-05 = PTO1 high‑side output shorted to earth; circuit-level electrical fault. [Elektroda, darfur5, post #16663503]
- PTM/FFR is the vehicle control computer used across MAN TG series since ~2000. [Elektroda, svavecone, post #16677105]
- PTO actuation uses an air valve commanded by PTM; wiring/valve damage can trigger 05622-05. [Elektroda, svavecone, post #16667958]
- PTO is optional; you can remove/disable it via MAN Cats to clear PTM complaints. [Elektroda, darfur5, post #17644722]
- Typical PTO relay/plug is on the passenger side; relay under front grille, plug near engine/cabin sensor. [Elektroda, Kaze89, post #17806935]
What does PTM error 05622-05 mean on a MAN TGX 2010?
It means the PTM detected a short-to-ground on the PTO1 high‑side output. This is an electrical circuit fault, not a software glitch. Inspect the PTO solenoid circuit first. [Elektroda, darfur5, post #16663503]
Where is the PTO control valve and how can I locate it quickly?
The PTO is air‑actuated. Pull the PTO air line, blow air into it, and trace where it exits to identify the correct valve among several. This speeds up locating the controlled valve on the chassis. [Elektroda, svavecone, post #16677155]
Is PTM standard or an add‑on module?
PTM (earlier FFR) is the core vehicle control computer on MAN TG ranges, present since around 2000. You cannot operate without it because it brokers engine–vehicle communications. [Elektroda, svavecone, post #16677105]
My truck has no PTO hardware—can I disable PTO1 in software?
Yes. PTO is optional. Use MAN Cats to configure PTM so PTO1 is not present. This removes recurring PTO faults after physical removal. [Elektroda, darfur5, post #17644722]
How do I clear 05622-05 if the PTO hardware was removed?
Either refit the correct valve/solenoid or install a suitable load resistor on the PTM’s PTO1 output to simulate the valve. Then clear codes. “Prepare a suitable resistance…and the error should disappear.” [Elektroda, svavecone, post #17783856]
Will a PTO1 fault stop the ZF Intarder 3 from working?
No. The PTO1 short‑to‑ground error does not affect Intarder logic. Troubleshoot the Intarder separately for its own codes and inputs. [Elektroda, svavecone, post #17783856]
Can the wrong valve or miswiring damage PTM/FFR?
Yes. A replacement valve with different pinout caused a short that destroyed an FFR. Everything should be protected, but failures happen. Edge case: controller damage after miswired valve. [Elektroda, thesperado, post #17783935]
Where are the PTO relay and factory signal connector located?
Expect a PTO relay under the front grille on the passenger side. Older models also have a PTO signal plug near the cabin‑lowering sensor at the rear of the engine. [Elektroda, Kaze89, post #17806935]
Three quick steps to diagnose a PTO1 short-to-ground
- Unplug the PTO solenoid and inspect the loom for chafing or earth contact.
- Fit the correct valve or a suitable resistor to the PTO1 output and observe code status.
- Clear codes with MAN Cats and recheck under load.
[Elektroda, svavecone, post #17783856]
What wire labels might I see in the PTO harness?
Users report four cut wires marked “70 157,” “70 391,” “70 393” (ignition‑switched +), and brown (earth). Verify against your truck’s wiring diagram before repairs. [Elektroda, uhr, post #18153197]
Is the PTO fault mechanical or electrical?
Electrical. The code indicates circuit resistance or shorting, not air system pressure. “The fault is purely electrical.” Focus on wiring, coil, and connector integrity. [Elektroda, svavecone, post #16667958]
What is PTM and how is it different from FFR?
Both are MAN control computers. FFR is the older generation; PTM is the newer name. They link engine and vehicle systems and manage outputs like PTO. [Elektroda, svavecone, post #16677105]
Autocom shows Intarder 4222 as active and won’t delete—normal?
Yes. One user saw 4222 (oil temperature sensor) stuck active in Autocom while other errors didn’t display. Use a marque‑specific tool for full Intarder diagnostics. [Elektroda, uhr, post #17784055]
How do I verify the Intarder temperature sensor reading?
Read the live data from the oil temperature sensor and confirm controller power and grounds. Fix power issues before chasing sensor faults. [Elektroda, svavecone, post #17784120]
Does PTM manage only one PTO?
This fault references PTO1. PTM can manage multiple PTO configurations, but 05622-05 specifically flags the first high‑side output. Treat it as a single‑circuit fault. [Elektroda, darfur5, post #16663503]
